Model "H" – Inline Dual Filter with Automatic Switchover, 1/4" - 6"
(10 - 100 PSI Differential Pressure, Line Pressure to 3,000 PSI)

With the Buckling Pin compact dual filter element switchover device, one filter disc is normally in the flow path. When the primary filter element becomes clogged, then there is a pressure differential across the element and across the balanced piston. When the differential across the piston reaches set point, the pin buckles the pin. The piston moves to uncover the reserve filter element.
ADVANTAGES: A visual inspection tells when the primary element is clogged. The uncovered reserve element allows continued safe operation. A proximity switch to detect a rising piston stem can be used as a remote warning.

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.
• 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.