Model "J-A" – Inline Check Valve Type ESV
2" - 6" (50 - 1,440 PSI) Flowing Pressure Only, 150#, 300#, 600# Flanges

The Model "J-A" ESV is designed to utilize the directional flow to accelerate the closing process of the clapper in the valve. The valve sees only the inline flowing pressure and is in an open state until an overpressuring of the system media occurs.
When this happens, the pressure on the piston increases and buckles the pin at set point.
The piston movement releases the clapper – allowing gravity and the media to move the clapper closed to a bubble-tight seal.
Once the system problem is corrected, the valve is reset. With no pressure on the clapper, the clapper is raised by the external handle and the piston is pushed in to hold the clapper in the open position.
The buckled pin is replaced with a pin of the proper setting (colored to match the colors of the holding nut). You are now able to to return to normal operation.
ADVANTAGES: Excellent accuracy, simplicity(two moving parts) and proven reliability.

Additional advantages of using Buckling Pin ESV's are as follows:
• You get safety without venting pollution.
• No product loss by venting.
• No flare system required.
• No yearly valve testing.
• No required replacing of pin yearly due to fatigue.
• The pin obeys Euler's Law precisely and cannot fatigue.
• There is no set pressure variation with ambient temperature change on the pin.
• The beauty of our system is in its simplicity. (In many, there is only one moving part and
.....in all designs, the precise pin is the sensor and actuator.)
• The standard accuracy is +/- 5%.
• Buckled pins can be replaced in minutes.
• Replacement pins are relatively inexpensive and, if ordered from the factory before noon,
.....they can be shipped the same business day.

Model "J-A" – Inline Check Valve Type ESV
6" – 600# Flange