2026~2027A Parts list & Schematic

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ORRISEAL

OPERATING AND MAINTENANCE MANUAL Series 2026, 2027A No-Freeze Valve

4.

WARNING! Before disassembly or maintenance, all pressure in

this device must be relieved. Failure to relieve pressures may result in personal injury or device damage. The resulting uncontrolled venting or spilling of process fluids may cause personal injury, loss of process control or environmental contamination.

PREVENTIVE MAINTENANCE 1. Seat Check every six (6) months if in normal service, i.e. no sand or abrasives

5.

Actuator Check diaphragm and o-rings once a year. General Maintenance when disassembling any portion of the valve always check the orings for wear and/or damage before reassembling the valve. Body Under normal conditions the body should last years. However, under severe conditions, i.e. corrosion, sand, high

pressure drops, etc valve life could be numbered in days only.

Inspect the body

every time actuator is removed.

and low pressure drop. If in severe service, i.e.

sandy conditions and high pressure

2.

drop, check every sixty (60) days. Inner Valve Check every six (6) months if

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in normal service, i.e. no sand or abrasives and low pressure drop. If in severe service, i.e. sandy conditions and high pressure drop, check every sixty (60) days. Packing Plug Check once a year.

APPLICATION The Series 2026/2027A is specifically designed as a high pressure dump valve for separators and other process vessels. The body screws directly into the vessel connection. This places the inner valve inside the vessel which allows any warm fluid present to retard freezing inside the valve body.

TROUBLE DIAGNOSIS Solution Problem Cause Valve leaks when in the closed Something under the plug or valve plug Remove the spring tension from the position. valve if a spring closing valve. and seat are worn. Remove valve top from body by loosing the hammer nut. By visual inspection, you can see whether the Diaphragm housing leaks air from breather plug.

Valve Leaks. Flow under plug Valve normally closed. Seat and plug ok, spring ok, nothing under plug

Valve will not open.

Flow over the

plug Normally closed valve.

plug and seat are worn. Plug is usually the first thing to be replaced. Worn out diaphragm or diaphragm Remove pressure from dia-phragm plates have worked loose and need housing and disassemble the top. tighting Replace diaphragm and o-ring. If diaphragm nuts are loose, tighten them.

Pressure drop too great across the

If spring is compressed all the way,

then the valve orifice is too big, Check valve pressure drop table for limits on the pressure drop. Pressure drop across the seat is too Reduce spring tension. If this does not valve.

great.

allow valve to open, then the valve orifice is too big Consult the pressure drop table for a smaller plug size.

702006M - 02003 September

P 0 Box 40525, Houston, Texas USA 77240-0505 Tel 713-466-3552 Fax 713-896-7386 www nornseal com

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