Type S301D and S301F
Fisher Controls
Instruction Manual
Type S301D and S301F Gas Regulators
January 1984
Form 5194
WARNING Fisher regulators must be installed, operated, and maintained in accordance with federal, state, and local codes, rules and regulations, and Fisher instructions. If a leak develops in the system, service to the unit may be required. Failure to correct trouble could result in a hazardous condition. Call a gas serviceman to service the unit. Only a qualified person must install or service the regulator.
Introduction Scope of Manual This manual provides installation, maintenance, and parts information for Type S301D and S301F gas service regulators.
Product Description The S301D and S301F are pilot operated regulators intended for general pressure reduction and industrial applications using pressure factor measurement, also referred to as fixed factor billing. A downstream control line is required for S301F while S301D has internal pressure registration.
Figure 1. Type S301D or S301F
should be adequately protected from physical damage. Under enclosed conditions or indoors, escaping gas, such as in the case of a ruptured diaphragm, may accumulate and be an explosion hazard.
Specifications
Installation WARNING Personal injury or system damage may result if this regulator is installed, without appropriate overpressure protection, where service conditions could exceed the limits given on the regulator nameplate. Regulator installations
Š Fisher Controls 1984, 1989; All Rights Reserved
CAUTION Like most regulators, S301D and S301F regulators have an outlet pressure rating lower than their inlet pressure rating. If actual inlet pressure can exceed the outlet pressure rating, outlet overpressure protection is necessary. However, overpressuring any portion of the regulators beyond the limits in table 2 may cause leakage, damage to regulator parts, or personal injury due to bursting of pressurecontaining parts.
D400005X012
Specifications for the regulators are shown in table 1.
Type S301D and S301F Table 1. Specifications
BODY SIZES AND END CONNECTION
3/4 x 1, n 1 x 1, n 1-1/4 x 1-1/4, 1-1/2 x 1-1/2, or n 2 x 2 inch NPT screwed n 2 x 2 inch ANSI flanged
SEAT RING PORT DIAMETERS
See table 2
n
See tables 2 and 3
TEMPERATURE CAPABILITIES
-20° to +170° F (-29° to 77° C)
MAXIMUM ALLOWABLE INLET PR ESSU R ES MAXIMUM EMERGENCY OUTLET PR ESSU R E
25 psig (1.7 bar)
PR ESSU R E REGISTRATION
Internal (S301D) or Downstream Control Line (S301F)
OUTLET PRESSURE RANGE
2 to 20 psig (0.14 to 1.4 bar)
APPROXIMATE WEIGHT
10 pounds (4.5 kg)
n
Some type of external overpressure protection should be provided if inlet pressure will be high enough to damage downstream equipment. Common methods of external overpressure protection include relief valves, monitoring regulators, shutoff devices, and series regulation.
Table 2. M axim um Inlet Pressure* SEAT RING PORT DIAMETER
If the regulator is exposed to an overpressure condition, it should be inspected for any damage that may have occurred. Regulator operation below these limits does not preclude the possibility of damage from external sources or from debris in the pipeline.
MAXIMUM INLET PRESSURE
In.
mm
Psig
B ar
3/16† 1/4
4.8† 6.4
125 125
8.6 8.6
3/8 1/2 3/4
9.5 12.7 19.0
80 60 20
5.5 4.1 1.4
* Maximum differential pressure: 1.5 psi (0.1 bar). Maximum emergency outlet pressure: 25 psig (1.7 bar). † For use on Type S301F only.
from the entry of water and from blockage, see figure 1 showing pilot vent pointed down. Before installing the regulator, check for damage which might have occurred in shipment. Also check for dirt or foreign matter which may have accumulated in the regulator body or in the pipeline and install the regulator so that flow is in the direction of the arrow cast on the body.
On S301F units only, connect downstream control line tubing to the tee in the lower casing, and run the tubing approximately 20 inches downstream. For best results, the control line tubing should be 3/8 inch O.D. or larger.
Do not install the regulator in a location where there can be excessive water accumulation, such as directly beneath a down spout. Position or protect the pilot vent opening
If the regulator is used in conjunction with a Type 289H relief valve, the 289H should be set 3/4 psi higher than the outlet pressure setting of the regulator.
Table 3. Allowable Inlet Pressure Variation For M aintaining Outlet Pressure ± 1 Percent of Setting (Accuracy Applies to Absolute Outlet Pressure, Psia) SEAT RING PORT DIA.
ALLOWABLE INLET PRESSURE VARIATION RANGE 2 Psig (0.14 Bar) Outlet Pressure Setting*
5 Psig (0.34 Bar) Outlet Pressure Setting*
10 Psig (0.69 Bar) Outlet Pressure Setting*
15 Psig (1.0 Bar) Outlet Pressure Setting*
20 Psig (1.4 Bar) Outlet Pressure Setting*
In.
mm
Psig
B ar
Psig
B ar
Psig
B ar
Psig
B ar
Psig
B ar
3/16# 1/4
4.8# 6.4
P 1 ± 35† P 1 ± 35†
P1 ± 2.4† P1 ± 2.4†
P 1 ± 45† P 1 ± 45†
P1 ± 3.1† P1 ± 3.1†
12 to 125 12 to 125
0.83 to 8.6 0.83 to 8.6
17 to 125 17 to 125
1.2 to 8.6 1.2 to 8.6
22 to 125 22 to 125
1.5 to 8.6 1.5 to 8.6
3/8 1/2 3/4
9.5 12.7 19.0
P 1 ± 35† 4 to 60 4 to 20
P1 ± 2.4† 0.28 to 4.1 0.28 to 1.4
7 to 80 7 to 60 7 to 20
0.48 to 5.5 0.48 to 4.1 0.48 to 1.4
12 to 80 12 to 60 12 to 20
0.83 to 5.5 0.83 to 4.1 0.83 to 1.4
17 to 80 17 to 60 17 to 20
1.2 to 5.5 1.2 to 4.1 1.2 to 1.4
22 to 80 22 to 60 —
1.5 to 5.5 1.5 to 4.1 —
* For best performance, outlet pressure setting should be made using an inlet pressure that is midway between the highest and lowest expected inlet pressure variation.
† P1 is the actual inlet pressure at which the outlet pressure setting is made.
Variation must not be higher than the maximum allowable inlet pressure for the seat ring size involved nor lower than the outlet pressure setting plus 1.5 psi (0.1 bar), the minimum pressure drop. See table 2 for maximum allowable inlet pressure. # For use on Type S301F only.
2
Type S301D and S301F The S301D and S301F should be protected against inlet pressures greater than the maximum listed in table 2 for each specific seat ring size. Inlet pressures in excess of the maximum recommended inlet pressure ranges may impair regulator performance. The regulator should be inspected for damage after any outlet overpressure condition. Table 3 shows allowable inlet pressure ranges for maintaining the outlet pressure (psia) within specific limits. Factory setpoint inlet pressures for various seat ring sizes are: 3/16 and 1/4 inch : 70 psig, 3/8 inch: 50 psig, 1/2 inch: 35 psig, and 3/4 inch: 15 psig.
PILOT RELIEF VALVE MAIN DIAPHRAGM
Startup CAUTION Pressure gauges should always be used to monitor downstream pressure during startup. Procedures used in putting this regulator into operation must be planned accordingly if the downstream system is pressurized by another regulator or by a manual bypass.
VALVE DISC
SEAT RING INLET PRESSURE DOWNSTREAM PRESSURE LOADING PRESSURE
Figure 2. Operational Schematic
pressurization of the regulator. The steps below apply to the typical installation as indicated. If the downstream system is not pressurized by another regulator or manual bypass valve, use the following procedure to start-up the regulator.
1. Open valves downstream of the regulator.
1. Check to see that all appliances are turned off.
3. Pressure releases downstream.
2. Slowly open the upstream plug cock.
Principle of Operation
3. Check all connections for leaks. 4. Light the appliance pilots.
Adjustment To increase the outlet pressure setting of the regulator, the adjusting screw of the pilot (key 10, figure 4) must be turned clockwise. This requires loosening the locknut (key 11). To reduce the outlet pressure setting, turn the adjusting screw counterclockwise. Retighten the locknut. Do not remove the locknut or adjust the spring to produce an outlet pressure setting outside the range of 2 to 20 psig. A pressure gauge should always be used to monitor downstream pressure while adjustments are being made.
Shutdown Installation arrangements may vary, but in any installation it is important that the valves be opened or closed slowly and that the outlet pressure be vented before venting inlet pressure to prevent damage caused by reverse pressurization
2. Slowly close the upstream shutoff valve.
Both S301F and S301D have spring-to-close construction which permits “two path control� where changes in the reduced pressure register beneath the main regulator diaphragm and the pilot diaphragm as well, refer to figure 2. Inlet pressure is also used for the pilot supply pressure. If downstream flow increases, lowering the reduced pressure below the regulator set point, pressure under the pilot diaphragm and the main regulator diaphragm decreases. The pilot opens to supply the required loading pressure increase. The increased loading pressure from the pilot overcomes the spring force, and the main regulator valve disk moves farther open, to supply the required flow. When downstream pressure increases due to lowered demand, greater pressure is registered beneath the pilot and main diaphragms. The pilot starts to close, and the excess loading pressure bleeds off to downstream through the pilot body. With the lower loading pressure, the spring can move the main valve disk closer to the seat ring. Since a main regulator diaphragm differential pressure of only about 1/2 psi is sufficient to stroke the main
3
Type S301D and S301F
regulator valve disk fully open, a relief valve is used to keep loading pressure in the main regulator spring case within acceptable limits. The relief valve opens and excess loading pressure is dumped into the downstream system when pilot output exceeds the downstream pressure by about 5 psi. The relief valve, located in the pilot body, is non-adjustable. Under normal flow conditions, the excess loading pressure bleeds through the pilot restriction hole to the downstream system until the pressures are equal.
Maintenance WARNING
4. Lift the diaphragm assembly slightly so that the pusher post (key 7) can release the valve lever (key 14). 5. Unscrew the diaphragm rod from the pusher post. The diaphragm can be disassembled by removing the spring seat (key 6) and the retainer (key 8). 6. Reassemble in the reverse order of the above procedure. Be sure the diaphragm is aligned correctly. The texturized side of the diaphragm should be towards the diaphragm head and lower casing. Be sure the diaphragm does not fold over at the flange when tightening the flange screws.
To Replace Valve Disk and Seat Ring 1. Remove the tubing connector (key 113, figure 5) from the regulator body (key 23, figure 3).
To avoid personal injury or equipment damage, do not attempt any maintenance or disassembly without first isolating the regulator from system pressure and relieving all internal pressure as described in “Shutdown�. Regulators that have been disassembled for repair must be tested for proper operation before being returned to service. Only parts manufactured by Fisher should be used for repairing Fisher regulators. Relight pilot lights according to normal startup procedures. Due to normal wear or damage that may occur from external sources, this regulator should be inspected and maintained periodically. The frequency of inspection and replacement of parts depends upon the severity of service conditions or the requirements of local, state, and federal rules and regulations.
2. Remove the cap screws (key 28) which hold the union ring portion of the lower casing to the body. 3. The regulator can be removed from the body, exposing the disk holder assembly (key 19) and the seat ring (key 24). 4. Examine the seating surface of the disk holder assembly. If it is nicked, cut, or otherwise damaged, the disk holder assembly should be unscrewed from the valve stem (key 17A) and replaced. 5. Examine the seating edge of the seat ring (key 24). If it is nicked or rough, it should be unscrewed from the body with a 1-1/16 inch socket wrench and replaced with a new seat ring to provide proper shutoff. Treat the male threads of the new seat r ing with pipe compound before reassembling.
To Replace Main Diaphragm
6. Reassemble in reverse order of the above procedure. Make sure that the lever has not become detached from the pusher post. Care should be taken so that the O-ring (key 27) is not cut.
1. Disconnect the tubing connectors (keys 111 & 117, figure 5) from the pilot.
Parts Ordering
2. Remove closing cap (key 4, figure 3) and unscrew the adjusting screw (key 3). Take out the lockwasher (key 104), upper spring seat (key 119), and spring (key 2).
The type number, seat ring (port) size, and date of manufacture are stamped on the nameplate. Always provide this information in any correspondence with your Fisher representative regarding replacement parts or technical assistance. If construction changes are made in the field, be sure that the nameplates are also changed to reflect the most recent construction.
3. Take out the spring case screws and lift the spring case (key 1) with attached pilot off the lower casing (key 10) and the diaphragm rod (key 105).
4
Type S301D and S301F
Figure 3. Main Regulator
Parts List Main Regulator — Figure 3 Key
Description
1
Spring Case Assembly Spring For S301D For S301F Adjusting Screw Closing Cap Diaphragm Diaphragm Pad Diaphragm Head Spring Seat Pusher Post Retainer Lower Casing For S301D For S301F Union Ring Split Ring
2
3 4 5A* 5B* 5C 6 7 8 10
11 12
Part Number
T12459 T0012 0N0394 27222 1B4136 27222 1E9853 24142 1J3165 44012 T11227 02532 1E9870 04032 T20289 25062 T11226 25062 T40095 08012 T11231 24132 T13157 T0012 13A508 1X012 T11216 08012 T11206 37022
Key
Description
13
Stem Guide For S301D T20776 T0012 For S301F T20605 T0012 Valve Lever T11386 25062 Pivot Pin 1E9837 35172 Screw (2 req'd) T11539 28982 Valve Stem T11387 X0012 Pin T11243 28982 Disc Holder AssemblyT12523 T0012 Disc Holder T12285 09012 Cap Screw (Not Shown) (8 req'd) T10708 24912 Nut (Not Shown) (8 req'd) 1E9853 24142 Body 3/4 x 1 inch T20600 T0012 1 x 1 inch T20624 T0012 1-1/4 inch 13A508 4X012 1-1/2 inch T20599 T0012 2 inch T20601 T0012 2 inch flange T40305 T0012
14 15 16 17A 17B 19* 19A* 21 22 23
Part Number
Key
Description
24
Seat Ring 3/16 inch (S301F) 1/4 inch 3/8 inch 1/2 inch 3/4 inch Baffle (S301D) O-Ring Cap Screw (2 req'd) Closing Cap Gasket O-Ring Lockwasher Diaphragm Rod Decal Nameplate Nameplate Upper Spring Seat Apply Magnalube G Apply Never Seez
26 27* 28 33* 36* 104 105 106 107 119 120 121
Part Number
T11224 09012 T12522 T0012 T11223 09012 T11220 09012 T11219 09012 T13158 T0012 T11211 06992 T11208 28982 T13095 T0012 T11789 06562 T12466 T0012 13A507 9X012 T12743 T0012 13A516 7X012 13A508 0X012
* Recommended spare part
5
Type S301D and S301F
TYPE S301D
TYPE S301F
APPLY SEALANT
Figure 4. Pilot Regulator
Figure 5. Tubing Hook-Up
Parts List Pilot — Figure 4 Key
Description
Part Number
1 2 3 4 5 6 7 8 9 10 11
Body Assembly 1B7971 Bonnet 2B7974 Body Plug 1B7975 Inner Valve 1D5604 Valve Spring Seat 1E5322 Valve Spring 1B7979 Diaphragm Assembly1B7980 Upper Spring Seat 1B7985 Spring, 2-20 psi 1B9860 Adjusting Screw 10A209 Locknut 13A516
X0092 08012 14012 000A2 11032 37022 000B2 25062 27212 9X012 8X012
Key
Description
12 23 24
Screw (6 req'd) Gasket Screen Holder Assembly Relief Valve
42
Key
Description
1B7839 28982 1C4957 04022
113
1C7712 000A2 16A592 9X012
114 115 116 117
Connector S301D, steel S301F, brass Bushing Nipple (S301F) Tee (S301F) Connector (2 req'd) S301D, steel S301F, brass Tubing S301D, steel S301F, copper Apply lead seal Connector (S301D) Steel
Tubing Hook-Up — Figure 5 109 110 111
112
Bushing Nipple Connector S301D, steel S301F, steel Supply tubing S301D, steel S301F, copper
While this information is presented in good faith and believed to be accurate, Fisher Controls does not guarantee satisfactory results from reliance upon such information. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding the performance, merchantability, fitness
Fisher Controls Printed in USA
Part Number
1H1714 28992 1C4882 26232
118
1N5926 28992 1A6381 14012
123 124
Part Number
1R4316 28992 1A3959 14012 1A3424 28992 1C6789 26232 1C5975 47362 1J1395 28982 1B8856 18992 T13168 T0012 T12463 T0012
1J1396 28982
T12517 T0012 T12462 T0012
or any other matter with respect to the products, nor as a recommendation to use any product or process in conflict with any patent. Fisher Controls reserves the right, without notice, to alter or improve the designs or specifications of the products described herein. For information, contact Fisher Controls: Marshalltown, Iowa 50158 USA Cernay 68700 France
Sao Paulo 05424 Brazil Singapore 0512