Project Description

Model A – Isolation

Model A Isolation

The Model A is an angle body valve that holds a bubble-tight, open position until flowing pressure acting on the unbalanced stem area puts an axial force on the pin. At set point, the pin buckles and the valve closes for a bubble-tight seal. In case of a downstream line break, the mass velocity impinging on the lower piston surface will force the pin to buckle and the valve will seal closed. Unlike conventional valves and rupture discs, the Model “A” proves it is environmentally friendly by keeping you from flaring production or venting production to the atmosphere.

Model A – Isolation

Set Pressure: 40-500 Psi
Accuracy: + / – 5%
Connections: Standard 2″ NPT and custom connections available.
Seals: Available for high & low temperatures, viton standard.
Standard Materials: Body mild steel, stainless steel trim is standard, other materials optional.


Product Feature

The pin is located outside the valve and is the heart of the operation, acting as the sensor and actuator. Once buckled, one person in under a minute can reset the pin in place without breaking the line.


The Model A Isolation valve keeps well pressure from exceeding D.O.T. transmission limits and protects the meter run from excess pressure. It is part of our line of pressure isolation valves is primarily used to prevent damage to downstream equipment including meter houses and line transitions.


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