The lexicon of the safety valve

The pressure safety valve may also be termed, less accurately, a pressure relief valve.

The valve’s set pressure is the maximum pressure admissible in the inlet circuit. Once reached, that pressure overcomes the force of the spring keeping the valve closed. The spring exerts a force that is adjustable by means of its greater or lesser compression (“spring loading”).

The detection surface is the valve seat area subjected to the inlet pressure of the liquid.

The disc and valve seat when pressed into contact by the spring form a seal. The valve is closed.

It is kept closed by the mobile disc, under the force exerted by the compressed spring. Spring force is adjustable to a set level beyond which the counteracting pressure of the liquid forces valve opening

The valve seat is the resting point of the disc when the valve is closed.

The valve seat often features a nozzle, which is the valve’s pressure release channel, whose diameter conditions the flow rate of the escaping liquid.

The set pressure is the pressure at which the inlet fluid begins to lift the disc from its seat, breaking the seal. At this point the valve begins to open because the force of the spring holding the disc in place is overcome.

Sandrine SELVARADJOU (Sales Department), Marine JUDENNE (Technical Department)

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