Utilizing clean gas to reliably operate main and pilot relief valve

An inert clean gas relief valve system for maintaining the cleanliness of internal components comprising:

• a relief valve assembly comprising:
• a main relief valve positioned adjacent a valve seat of a pressure vessel containing a sour gas, the main relief valve comprising:
• a main valve diaphragm selectively sealable against the valve seat of the pressure vessel, the valve diaphragm enclosing a valve dome containing an inert clean gas;
• and
• a hollow valve tube in pressure communication with the valve dome;
• and
• a pilot relief valve in pressure communication with the pressure vessel and the valve dome of the main relief valve, and having a pilot seat selectively sealable against the hollow valve tube, the pilot relief valve comprising:
• a biasing mechanism in communication with the pilot seat to urge the pilot seat toward sealed engagement with the hollow valve tube;
• and
• a sense diaphragm attached to the pilot seat and enclosing a sense cavity that contains the inert clean gas and is in pressure communication with the valve dome and the pressure vessel so that when a pressure in the pressure vessel exceeds a predetermined level, pressure within the sense cavity urges the sense diaphragm and the pilot seat away from the hollow valve tube releasing the inert clean gas from the valve dome, which in turn allows compression of the valve diaphragm so that it separates from the valve seat, thereby allowing sour gas to escape from the pressure vessel;
• a gas cylinder containing the inert clean gas;
• a gas line fluidly connecting the gas cylinder and the relief valve assembly, the gas line for transporting the inert clean gas from the gas cylinder to the relief valve assembly;
• and
• at least one pressure regulator positioned in the gas line for controlling the flow rate of the inert clean gas from the gas cylinder.