Instruction Manual Form 5470 January 1999
Design CVX-A
Design CVX-A Steam Conditioning Valve Contents Introduction
.............................. 1 Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Principle of Operation
................... 3
Valve and Instrumentation Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Piping Considerations . . . . . . . . . . . . . . . . . . . . . . . . 4 Location of Pressure Tap . . . . . . . . . . . . . . . . . . . . . . 5 Location of Temperature Sensor . . . . . . . . . . . . . . . 5 Control Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation
................................ 5
Maintenance
.............................. 6 Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Removal of Valve Bonnet and Trim . . . . . . . . . . . . . 6 Removal and Replacement of Nozzles . . . . . . . . . . 7 Valve Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
Introduction
W7011 / IL
Figure 1. Design CVX-A Control Valve
Scope of Manual
Only personnel qualified through training or experience should install, operate, and maintain a Design CVX-A valve. If you have any questions about these instructions, contact your Fisher Controls sales office or sales representative before proceeding.
Description The Design CVX-A steam conditioning valve, figure 1, provides a convenient and efficient way to reduce steam pressure and temperature within a single device. Typical installations are primarily in the process steam area and other areas requiring small to moderate pressure reduction ratios and water requirements, while desiring dependable and accurate control of steam pressure and temperature.
D102619X012
This instruction manual includes installation, maintenance, and operation information for the CON-TEKR Design CVX-A control valve. Refer to separate instruction manuals for instructions covering the actuator and accessories.
Design CVX-A Table 1. Specifications (for Standard Designs)
End Connection Sizes Design CVX-A: R 1 through 20-inch steam inlet, R 2 through 42-inch steam outlet, and R 1 through 2-inch spraywater End Connection Types R ANSI Buttweld (all sizes) R ANSI Raised Faced Flanges (all sizes) R ANSI Socket Weld (1 through 3-inch)
Configurations R Angle Pattern (Standard) R ”Y” Pattern (Optional)
ANSI Ratings
Special materials such as F91 or stainless steel possible upon request Control Plug Sizes 36 through 285: 410 SS with Alloy 6 Guiding and Seating Surfaces Stem Stem Sizes 1/2 through 1-1/4 Inch Diameter: SA 479 Type XM-I9 Stem Sizes 2 Inch Diameter and Larger: SA638 Grade 660 Cl A Control Sleeve Sizes 36 through 68: SA182 Grade F22 Ion Nitrided Sizes 82 through 285: SA217 Grade WC9 Ion Nitrided
R Class 150 through 1500
Bonnet Types Bolted: Class 150 through 1500 Shutoff Classifications per ANSI/FCI 70-2 R Class IV (standard)
Trim Characteristics R Linear (standard) R Equal Percentage R Special
Body/Bonnet R SA105 Carbon Steel R SA182 GR Fl l (1-1/4 CR- 1/2 MO) R SA182 GR F22 (2-1/4 CR- 1 MO)
2
Seat Sizes 36 through 68: SA479 Type 410 with Alloy 6 Seating Surface Sizes 82 through 285: A743 Grade CA15 with Alloy 6 Seating Surface Piston Rings Alloy 25 or Alloy 6 Gaskets Inconel/Graphite Packing Graphite/Grafoil Nozzles R SA479 Type 410 (A/F Variable Orifice Nozzles and Drilled Hole Orifices) R Type 303 SS (Fixed Orifice Nozzles)
Design CVX-A
W7013-1/IL
Figure 2. Design CVX-A Cross Sectional View.
Principle of Operation The positioning of the main valve plug controls the water and steam flow (see figure 2). The control sleeve has an array of orifices to provide the steam side control characteristic specified. As the plug is lifted from the seat, steam is allowed to pass into the center of the control sleeve, and out through the seat orifice. At the same time, water is allowed to pass through orifices in the upper water tube and out the lower water tube injection area. A signal from the pressure control loop to the valve actuator moves the valve plug within the control sleeve which increases or decreases the amount of free flow area. Retracting the plug increases steam and water flow. The valve plug has an integral water tube that connects the valve outlet (below the seat ring orifice), with an upper spraywater supply chamber. The upper portion of the water tube is machined with an arrangement of calibrated orifices to allow spraywater to enter and flow down toward the valve outlet. The water tube continues down below the seating surface on the valve
plug and is optimally located in an area of high turbulence and kinetic energy to provide maximum water and steam mixing. The water is injected and distributed quickly and evenly throughout the flow stream, providing the required attemporation.
The valve body is provided with a steam seating surface and a water sealing surface. The steam seat provides for positive shut-off of steam flow. It consists of a replaceable seat ring and a hardened valve plug. Piston rings on the valve plug reduce leakage between the guide surfaces. The water seal is a bushing type design which serves to meter the water flow and direct the flow through the upper water tube orifices. Positive water shutoff is accomplished with the external spraywater control valve (SWCV). The two control points are designed so that as the valve plug is lifted to permit flow of steam, a proportional amount of water flow is allowed. This provides an instantaneous increase in water flow as steam demand increases, affording more precise control of pressure and temperature during changing steam flows.
3
Design CVX-A
FISHER 667-EZ SPRAYWATER CONTROL VALVE
SPRAYWATER
PC
FISHER CVX-100-AA-FSB
STEAM
TC
STEAMFLOW
TE
B2538 / IL
Figure 3. Typical Design CVX-AA Installation.
Valve and Instrumentation Installation The Design CVX-A valve should be located in an easily accessible location with sufficient clearance for maintenance. Suggested minimum clearance for removal of the actuator and plug is shown on the dimensional drawings that are created specifically for each valve. Although the preferred position for easy maintenance is vertical, the Design CVX-A valve can be mounted in any position except with the stem pointing down. For additional information regarding installations, such as drains, refer to bulletin 85.1:015 CON-TEKR Steam Conditioning Valves Installation Guidelines.
4
Piping Considerations Maintain a minimum distance of three (3) feet of straight pipe upstream of the valve inlet connection. Downstream straight run piping is function of the particular operating conditions and is specified on the specific customer drawing for each valve. Indiscriminate use of pipe reducers or expanders to match the valve outlet to field piping is not recommended. Mismatched valve outlet piping can result in increased system noise and vibration levels. If field piping requires the use of these devices, reducers on the valve inlet should have a maximum angle of 30 degrees while outlet expanders should be limited to a maximum of 20 degrees. These recommendations are made to keep noise and vibration levels to acceptable limits.
Design CVX-A Location of Pressure Tap It is important that the pressure tap be located at a distance of not less than ten (10) feet from the outlet of the valve. The pressure sensor and transmitter should be mounted in accordance with the manufacturer’s instructions.
Location of Temperature Sensor The location of the temperature sensor is dictated by the operating conditions of the application and is shown on the customer specification sheet. The type of temperature sensor and thermowell selected can significantly affect the lag time and control parameters of the temperature control loop. Consult the manufacturer of the temperature sensor for details. Mounting of the temperature sensor and transmitter should be in accordance with the manufacturer’s instructions.
Control Strategies Pressure control is normally a closed loop feedback system controlling the outlet pressure. The temperature control strategy in this style valve is typically feedback in conjunction with the intrinsic mechanical feedforward design that allows for the automatic proportioning of water flow to steam flow. This design is best suited for those applications where the steam flow is variable and the inlet and outlet pressures remain constant. As the plug moves to adjust the flow of steam, the motion is simultaneously and proportionally transferred to a series of control orifices in the upper water tube. Control of these orifices allows the passage of a proportionate amount of water to travel from the upper chamber, through the plug, and be discharged into the outlet steam flow. These control orifices in the plug are proportionally sized and located with respect to the orifices in the steam control sleeve. This essentially provides a feedforward response for coarse control of spraywater to the steam flow. The downstream temperature sensor provides for fine tuning to exact requirements via input to an external water control valve and traditional temperature feedback control loop. See figure 3 for an example.
Installation WARNING Personal injury or equipment damage caused by sudden release of pressure may result if the Design CVX-A valve is
installed where service conditions could exceed the limits of the pressure class noted on the nameplate. To avoid such injury or damage, provide a relief valve for over pressure protection as required by government or accepted industry codes and good engineering practices. 1. Before installation, all piping upstream of the valve must be blown clean so that no particles, such as welding slag, dirt or other foreign matter, are left in the pipe. Use care to keep foreign matter out of the line openings while preparing the valve installation. 2. Verify that the valve is clean inside. If possible, before fitting in the line, connect the actuator to a temporary air supply and operate to verify positioning. Disconnect the instrument lines (if applicable.)
WARNING Do not lift the valve by its actuator yoke. Personal injury or damage to equipment could occur if the valve is improperly lifted into place. 3. Arrange a lifting sling around the main valve body to safely lift the valve to the pipe opening.
WARNING Do not expose the valve to undue stresses by installing it in bent pipes or flanges. Personal injury and equipment damage could result from flange sealing failure due to improper installation. 4. Flanged Connections—Grease the flange connection bolts with a high temperature thread lubricant. Install flange gaskets and connection bolts per accepted practices and tighten securely. 5. Welded Connections—Welding procedures should be in accordance with the applicable codes and the base materials. For preheat, welding electrodes, and postweld heat treatment, refer to the applicable codes and practices. Materials are specified on the customer specification sheet. If the valve inlet and outlet connections are to be welded with the valve assembled, the valve plug should be maintained off the valve seat during all associated operations. If the valve is to be welded by SMAW process, the valve should be disassembled for welding to ensure that any weld slag is removed from the valve. 6. Flush the cooling water line until all debris is removed from the line prior to connecting it to the Design CVX-A valve. Use only clean sources of cooling water to reduce the possibility of nozzle clogging. A 100 mesh strainer should be installed on the water line
5
Design CVX-A as close to the valve as possible. Review strainer manufacturer’s pressure drop curves to determine appropriate strainer body size. You may need to use a strainer, which is larger than the water line size. 7. A straight run of pipe is required downstream of the Design CVX-A valve to ensure complete vaporization of cooling water. Consult the Design CVX-A customer specification sheet for the required distance of straight pipe. 8. Typically, a temperature sensor should be mounted a minimum distance of 30 feet (9.1 m) downstream of the Design CVX-A valve. This distance will vary depending on a number of factors including steam velocity and percentage of spraywater. Consult the customer specification sheet provided with the unit for this distance. If you have any questions, contact your Fisher Controls sales representative or sales office. The steam line should not have any branch lines dividing the steam flow between the Design CVX-A valve and the temperature sensor. 9. A typical control loop is illustrated in figure 3. A pressure transmitter senses the pressure downstream and the pressure controller sends a signal to the actuator positioner opening or closing the Design CVX-A valve as required to maintain pressure. A rising stem opens the Design CVX-A valve to allow additional steam flow. A temperature sensor (TE) measures changes in temperature and transmits a signal to the temperature control device. The output signal from the controller is sent to the positioner on the cooling water (spraywater) control valve (SWCV). The positioners output signal strokes the SWCV open, increasing water pressure on the nozzles. Increasing water pressure upstream of the nozzles increases water flow through the nozzle(s).
CAUTION Pneumatic lines (where applicable) should be thoroughly blown clean with dry air before connection. Check electronic lines for correct connection. 10. If foreign debris has been introduced into the valve or upstream piping during installation, it must be removed prior to using the valve for the first time. A Blowout or Blow-through tool can be purchased to match the Design CVX-A valve and allow piping blowdown without removal of the valve from the line. 11. After cleanliness of the piping system has been assured, connect instrumentation and power supply to the Design CVX-A valve actuator and associated equipment. 12. Monitor the Design CVX-A valve as the system is brought on line. Some visible vapors may be seen as the lubricants are heated. If you see any steam leaks
6
after startup, disassemble the valve and replace the gaskets. If the stuffing box leaks, tighten gland nuts (key 68). If leakage continues, replace the packing.
Maintenance Servicing Due to the care Fisher Controls takes in meeting all manufacturing requirements (heat-treating, dimensional tolerances, etc.), use only replacement parts manufactured or furnished by Fisher Controls.
WARNING Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing any maintenance operations: R Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the actuator cannot suddenly open or close the valve. R Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure from both sides of the valve. Drain the process media from both sides of the valve. R Vent the power actuator loading pressure and relieve any actuator spring precompression. R Use lock-out procedures to be sure that the above measures stay in effect while you work on the equipment. Shut off water and steam flow and vent all system pressure before breaking any pressure boundaries.
CAUTION Residual system pressure may be released during the following steps if the system was improperly isolated or vented. Use extreme care to prevent personal injury while loosening any fasteners in the pressure boundary.
Removal of Valve Bonnet and Trim 1. Disconnect all field connections to the positioner and actuator and remove the actuator from the valve.
Design CVX-A STEM
material. Damage to the gasket mating surface may require bonnet replacement to avoid leakage.
BODY SPRING
NUT PIN
PLUG
WATER INJECTION HOLES A7191 / IL
7. Remove the seat (key 24), control sleeve (key 21), and plug assembly (key 22, 23, and 53) as a single unit by grasping the valve stem (key 23) and pulling the assembly from the body cavity. 8. Separate the control sleeve (key 21) from the seat (key 24) and remove the plug assembly (key 22, 23, and 53) from the control sleeve by pushing the plug assembly down through the lower end of the control sleeve. Reference figures 6 and 7 for guidance in performing this disassembly.
Consult the actuator manufacturer’s documentation for assistance in actuator removal.
9. Inspect hardfaced guiding and seating surfaces of the plug assembly and seat, as well as (if applicable) the piston rings (key 45 and 46), for wear or damage and replace if necessary.
2. Loosen the gland stud nuts (key 68) and remove along with the gland follower (key 65). If possible, remove packing rings (key 64) from the stuffing box.
10. Polish the control sleeve guiding surface. If the guiding surface is damaged, replace the control sleeve.
Figure 4. AF Nozzle Cross Section
3. Loosen bonnet bolts/nuts (key 55) using an even pattern to avoid uneven expansion of the gaskets. Remove the entire bonnet assembly, pulling evenly in line with the valve stem (key 23) centerline. Deviation from uni-axial motion can result in galling or bending of the valve stem. If difficulty is encountered removing the bonnet, check the bonnet for alignment and straighten the bonnet before making further attempts to remove it from the valve body.
11. Clean the valve seat. Light damage to the seating surface may be factory repaired by remachining the 45 degree seating angle. 12. Remove all used gaskets and foreign matter from the interior of the valve and from the inlet and outlet openings. If the valve is equipped with a diffuser, remove any foreign matter that may be trapped in the diffuser or that may be plugging the radial ports. Inspect all valve body guiding and sealing surfaces for any signs of wear.
Note
Removal and Replacement of Nozzles The bonnet must be handled with care while being removed from the body. Damage to the bonnet can result in gasket leakage while the valve is in service. Protect the bonnet by placing it on clean cloth or wood while the valve is disassembled.
The Design CVX-A lower water tube may have drilled holes to allow water passage, or be fitted with a nozzle. For drilled holes, inspect the holes and clean out any trapped debris. For removable nozzles that require replacement, use the follow instructions.
4. Inspect the water seat (key 25). Contact your Fisher Controls sales office or sales representative if damaged.
1. Cut the tack weld holding the spray nozzle (key 30) in place. After liberally soaking the nozzle threads with a suitable penetrant type thread lubricant, unscrew the nozzle from the lower water tube.
5. Dislodge any remaining packing rings (key 64) from the stuffing box. Remove the gland ring (key 63) from the bottom of the stuffing box. Inspect all parts; gland ring (key 63), gland follower (key 65), valve stem (key 23), and gland studs/nuts (key 68/69) for signs of wear. Replace all parts that are damaged or show excessive wear. 6. Inspect the bonnet guiding surfaces and gasket mating surfaces. Light damage on the guiding surface may be repaired with an emery cloth or other suitable
2. Screw in the new nozzle and tack weld with ER410 or other suitable filler material in the case of AF style nozzles (see figure 4) or E309L in the case of fixed orifice nozzles. Maintain low heat input to prevent distortion of the nozzle. 3. If old AF nozzles are to be further inspected or cleaned for future reuse, refer to figure 4 for guidance. All AF nozzle parts should slide easily and smoothly. Discard any nozzles that appear even marginally operational.
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Design CVX-A Table 2. Recommended Bonnet Bolt Torque BOLT SIZE Inch
THREADS PER INCH
RECOMMENDED BOLT TORQUE(1) LbfRft
1/4
20
9
5/16
18
18
3/8
16
31
1/2
13
71
9/16
12
95
5/8
11
125
3/4
10
200
7/8
9
290
1
8
405
1-1/8
8
550
1-1/4
8
730
1-3/8
8
980
1-1/2
8
1290
1-5/8
8
1650
1-3/4
8
2070
1-7/8
8
2560
2
8
3130
2-1/4
8
4490
2-1/2
8
6200
3
8
10800
1. Torques for lubricated studs with heavy hex nuts.
Valve Assembly 1. Cleaning—Make certain that all interior surfaces of the valve body and bonnet (including the stuffing box) are clean and free of dirt, including the inlet and outlet openings. All surfaces of the valve interior that receive mating parts should be given special attention when cleaning. All sliding, fit, and gasket sealing surfaces should be coated with Felpro C5A or other similar high temperature lubricant prior to reassembly (refer to figure 5 for reference). 2. Install the spiral wound seat gasket (key 41). If the valve is installed horizontally, the gasket can be held in place by sticking it to the valve body with a liberal coating of high temperature grease. 3. Before insertion of the plug assembly (key 22, 23, 53) with new piston rings (key 45, 46) in the control sleeve, all surfaces should be cleaned and generously lubricated with high temperature grease. Insert the plug into the control sleeve (key 21), taking care not to misalign the two. The piston rings will need to be slightly compressed to pass into the sleeve. Any binding between the plug and sleeve must be thoroughly investigated and corrected prior to proceeding. 4. Reattach the seat (key 24) to the control sleeve (key 21). Refer to figures 6 and 7 for guidance. Insert the control sleeve (key 21), plug assembly (key 22, 23, 53), and seat (key 24) as an assembly. Check to make sure the cage is located below the minimum cage depth mark on the inside of the body, near the top of
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the valve. The parts should slide easily into the valve body until the seat rests on the seat gasket (key 41). If resistance to insertion is felt, remove the seat and control sleeve and determine the cause of the problem before attempting reinstallation. 5. Lubricate bonnet studs (key 54) and fully screw them into the valve body. 6. Install the sleeve gasket (key 43). 7. Attach the bonnet gasket (key 44) in the bonnet gasket retaining groove with high temperature grease. 8. Lubricate the bonnet locating surfaces and carefully install the bonnet (key 6). Use care to avoid bending the stem. There will be a separation of about 1/8-inch between the bonnet and the valve body after the bonnet is fully inserted. 9. Install bonnet stud washers and nuts (key 52 and 55) and hand tighten. 10. Tighten the bonnet nuts (key 55) in a multi-step uniform cross pattern. Monitor the distance between the bonnet and body, keeping it even to ensure that the bonnet is being torqued evenly. It is recommended that torquing be performed in a minimum of four torque levels until the final torque level is achieved. You may need to torque multiple times at each torque level to ensure that the bonnet is torqued evenly. Required torque levels can be found in table 2, Recommended Bonnet Bolt Torque. 11. After the bonnet has been torqued to the required level, check the plug movement to ensure that the plug still moves freely. 12. Recheck cleanliness of the stuffing box. Insert the gland ring (key 63) over the stem and into stuffing box. Measure the depth of stuffing box before and after ring insertion to be certain that it has traveled to the bottom of the stuffing box. Insert packing rings (key 64), after lubricating with high temperature grease, into the stuffing box staggering the gaps on adjacent rings. The gland follower (key 65) can be used to ensure that each packing ring is pushed down before installing the next packing ring. 13. After all packing rings are installed, thoroughly lubricate the gland studs (key 69) and insert the gland follower (key 65) and the gland flange (key 66). Tighten the gland stud nuts (key 68) tight enough to block leakage but not so tight that stem travel is hindered. Consult table 3, Recommended Packing Nut Torque for recommended torque levels. Evenly tighten the nuts to the maximum level, then loosen and retighten to the minimum torque level. After operating, further tightening may be required to prevent leakage. 14. Install the actuator on the valve in accordance with the manufacturers standard procedure. After calibration of the actuator, the valve should be ready to return to service.
Design CVX-A Table 3. Recommended Packing Nut Torque STEM DIAMETER
MAXIMUM TORQUE
MINIMUM TORQUE
LbfRft
LbfRft
150 300 600 900 1500 2500 150 300 600 900 1500 2500 300 600 900 1500 2500
6 7 10 13 16 18 12 15 22 30 37 45 27 37 46 57 67
4 5 7 9 11 13 8 10 15 20 25 30 18 25 31 38 45
1-1/4
300 600 900 1500 2500
36 49 61 75 90
24 33 41 50 60
2
300 600 900 1500 2500
48 67 88 108 125
43 61 80 98 115
ANSI PRESSURE CLASS
Inch
1/2
3/4
1
Table 4. Troubleshooting Guide Problem
Possible Solution
Stem packing is leaking
Tighten stem packing nuts
Stem packing is leaking after tightening stem packing nuts
Repack and replace worn parts as needed
Actuator cannot open valve
Check actuator calibration Check for overtightening of the packing nuts Check for alignment between actuator and valve
Actuator action is “sticky” sticky
Check positioner calibration Replace plug, cage, stem guide and/or packing follower Check water source availability and pressure
Temperature setpoint is not reached
Check nozzle for plugging Make sure that steam saturation pressure is not above setpoint Check to ensure full spraywater control valve actuator stroke is reached Check temperature control loop – reset
Temperature Tem erature is below setpoint set oint
Check nozzle for fouling/poor spray pattern – clean/replace Check temperature sensor location – relocate per guidelines
Temperature oscillates around setpoint Water in steam line Water in steam line when steam line isolated Noise and vibration seem high Bonnet gasket is leaking
Tune control system parameters Temperature setpoint may be too close to saturation Check that steam traps are functioning properly Review piping configuration for downstream tees and elbows Check for leakage of spraywater control valve Review piping configuration and insulation Inspect valve diffuser Inspect body/bonnet mating surfaces, replace bonnet gasket. Ensure bonnet bolts are properly torqued
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Design CVX-A Troubleshooting Table 4 is intended as a basic first line troubleshooting guide. Contact your Fisher Controls sales office or sales representative for assistance if you are unable to resolve your field operation problem.
Parts Ordering Each Design CVX-A valve is assigned a serial number that can be found on the bonnet flange. Refer to the serial number when contacting your Fisher Controls sales office or sales representative for technical assistance. When ordering replacement parts, refer to the serial number and key numbers for each part required. The key numbers in the Parts List and in the Design CVX-A assembly drawing in figure 5 can be used to help in part identification.
Parts List Key 01
06
20
10
Description Body SA 105 SA 182 Grade F11 SA 182 Grade F22 Bonnet SA 105 SA 182 Grade F11 SA 182 Grade F22 Nozzle Body Flange SA 105 SA 182 Grade F11 SA 182 Grade F22
Key 21*
Description Control Sleeve SA 182 Grade F22 Ion Nitrided (SOD Sizes 36-68) SA 217 Grade WC9 Ion Nitrided (SOD Sizes 82-510) 22* Plug SA 479 Type 410/Alloy 6 (SOD Sizes 36-350) SA 182 GRF22/Alloy 6 (SOD Sizes 385-510) 23* Stem SA 479 Type XM-19, less than 2� diameter SA 638 Grade 660 Cl A, 2� diameter and larger 24* Seat SA 479 Type 410/Alloy 6 (SOD Sizes 36-68) A 743 Grade CA 15/Alloy 6 (SOD Sizes 82-510) 25 Water Seat SA 182 Grade F22 Ion Nitrided 30* Spray Nozzle SA 479 Type 410 or 303 SST 41* Seat Gasket Inconel 600/Graphite 43* Sleeve Gasket Inconel 600/Graphite 44* Bonnet Gasket Inconel 600/Graphite 45/46* Piston Rings Alloy 25 or Alloy 6 52 Bonnet Stud Washer Plated Steel 53* Stem Pin 316 SST 54 Bonnet Stud SA 193 Grade B7, SA105 Valves SA 193 Grade B16, SA182 GR F11 and F22 Valves 55 Bonnet Stud Nut SA 194 Grade 2H, SA105 Valves SA 194 Grade 7, SA182 GR F11 and F22 Valves 63* Gland Ring SA 479 Type 316 64* Packing Set Graphite/Grafoil 65* Gland Follower SA 479 Type 316 66* Gland Flange SA 479 Type 316 68* Gland Stud Nut SA 194 Grade 2H 69* Gland Stud SA 194 Grade B7
*Recommended spare parts
Design CVX-A
69 68 23
64
66 53 65 63 6
54 25 55 26
52
44 43 46 45 22 21 1 24 41
30
B2634 / IL
Figure 5. Design CVX-AA Assembly
11
Design CVX-A
INTERNAL THREADS
2
EXTERNAL THREADS 1. UNSCREW SEAT FROM CAGE. 2. REMOVE PLUG FROM LOWER END OF CAGE.
1
B2635 / IL
Figure 6. Design CVX-A Trim Assembly (Sizes 160 and Smaller)
INTEGRAL CAGE PIN (TWO, 180_ APART)
2
PIN SLOT (TWO, 180_ APART) 1. ROTATE SEAT UNTIL CAGE PIN ALIGNS WITH SEAT SLOT AND SEPARATE SEAT FROM CAGE. 2. REMOVE PLUG FROM LOWER END OF CAGE.
1
B2636 / IL
Figure 7. Design CVX-A Trim Assembly (Sizes 175 and Larger)
CON-TEK, Fisher, Fisher-Rosemount, and Managing The Process Better are marks owned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc. All other marks are the property of their respective owners. EFisher Controls International, Inc. 1999; All Rights Reserved
For information, contact Fisher Controls: Marshalltown, Iowa 50158 USA Cernay 68700 France Sao Paulo 05424 Brazil Singapore 128461 12 Printed in U.S.A.