Manual Reset Relay

Manual relay valve（Manually reset pneumatic relay valve、Manually reset the main control relay valve）

Sigma relay valveThe 11 series is a two position three-way, normally closed cut-off discharge manual reset relay valve.Sigma relay valveManually pull the knob outward to achieve pressure conduction from the gas source to the valve output end. When the black knob is pulled out and connected to the pilot air source pressure, the relay valve can maintain its normal working state. If the pilot gas source pressure is interrupted, the relay valve will cut off the gas source (inlet) channel and discharge the residual pressure in the controlled circuit.

This type of relay valve is commonly referred to asMain control relay valve of the unit/Group main control relay valve, mainly used for controlling the opening of ground safety valves on wellhead panels /Close the sequence of actions, or drive a typical pneumatic safety system that loses air and closes.

The relay valve adopts specially designed internal components, which can be easily implementedManual emergency shutdown（Push-To-Shut-In）In case of emergency shutdown（Under ESD conditions, the operating force required by on-site operators to close the safety valve is much lower than that of conventional manual reset relay valves.

core functionality

· Manual operation:Pull to open, press to close

· Pilot control: Automatic safety action upon loss of pressure, not automatic reset

· Cut off pressure relief:Block & Bleed， Cut off first and then release pressure

· Low pressure protection: The gas source automatically shuts off when it falls below the set value

· Dual phase control: Low voltage pilot maintains high voltage working circuit

· Lock pin function: Temporary bypass without pilot (some models)，Please consult us for details）

General Technical Specifications

1. Flow control form：Two position three-way, normally closed, cut-off pressure relief

2. Valve body connection size：The pilot port, air source port, valve door, and exhaust port are all 1/4-18 internal thread NPT

3. Throttle aperture:7/32 ', 1/4'

4. flow coefficient Cv：0.52

5. sealmaterial：Viton fluororubber (standard), Buna (low temperature)

6. Metal component material：316SS / 303SS

7. worktemperature

Standard type:-20 ° F to+250 ° F (-29 ° C to+121 ° C);

Low temperature type:-55 ° F to+250 ° F（-48℃ ～ +121℃）

For more detailed models and parameters, please consult us!