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Description
Safety relief valves are designed to keep the pressure bellow the preset pressure. Usually safety
relief valves are placed after pressure regulator. Safety relief valves are releasing small amounts
of gas if for some reason pressure increase above the preset activation pressure, like in the case
of regulator not closing perfectly, or for sudden pressure increase in the event of gas line fast closing.
Thanks to their effective release capacity and compact size, our safety relief valves are ideal for use
on gas metering and regulating stations for natural gas as well as on storage tanks for LPG,
propane - butane mixture, hydrogen, nitrogen and other technical, non-corrosive gases reservoirs.
Our safety relief valves are extremely easy to install and are designed for ready and easy maintenance.
Operation
If the pressure under the diaphragm or seat of the safety relief valve is higher than the force
generated by the preset spring, diaphragm is raised, causing the sleeve which is integrated
with the diaphragm to move and the natural gas is released through an orifice.
Safety relief valve activating pressure is set by adjusting the compression of the spring through
an appropriate ring. The set pressure should be an intermediate value between active regulator set
pressure, and the activation pressure of safety shut off valve. It is recommended that set pressure
for relief valve needs to be 15% higher than pressure regulator set pressure.
Installation
Safety relief valves are normally installed downstream of the pressure regulators. For keeping
the pressure in the installation bellow the set pressure, gas from the installation has to released.
Natural gas is thereby released into the atmosphere at an appropriate height. Also, gas release
pipe diameter has to be at least the same as safety relief valve outside diameter. The direction
of safety relief valve installation does not influence the performance of the valve.
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