Seeking help regarding pressure relief in the valve chamber
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The \"SH3136-2003 Safety Design Code for Spherical Storage Tanks of Liquefied Hydrocarbons\" requires that gate valves and ball valves used as shut-off valves shall be equipped with a pressure relief mechanism in their valve chambers. I’m seeking help from fellow sailors: what is a valve chamber pressure relief mechanism? How many different types of such mechanisms exist, and how can one tell, by looking at its appearance, whether it has a valve chamber pressure relief mechanism? It is best to bring a structural diagram and a physical image. Not very grateful
Plate gate valves can release pressure through the valve seat, while wedge gate valves generally have holes drilled in the inlet gate plate for pressure release; automatic pressure relief valves are rarely used for this purpose. Ball valves and SPE valves can release pressure via their own valve seats, and ball valves with two DPE valve seats can use automatic pressure relief valves for pressure release.
This post was last edited by Hongshanpoxia on July 22, 2017, at 08:55. Plate gate valves; plate gate valves with flow-guiding holes. Overview: A plate gate valve is a sliding valve whose closing element is a parallel gate plate. Its closing element can be a single gate or a double gate with a spreading mechanism in between. The pressing force of the gate against the valve seat is controlled by the medium pressure acting on the floating gate or the floating valve seat. In the case of a double-plate gate valve, the separating mechanism between the two gates can provide this compressive force. Flat gate valve: Structural features – The flat gate valve has a rational structure, reliable sealing, and easy operation. The sealing surfaces of these flat-plate gate valves are spray-welded with hard, high-pressure carbide alloys featuring guide holes; they offer advantages such as corrosion resistance, wear resistance, and erosion resistance, and can also be used for throttling. It is particularly suitable for on/off and control devices used to regulate the flow of control media in water, oil, slurry, and natural gas pipelines, where the operating pressure is ≤42 MPa and the operating temperature is ≤120°C. Suitable for use in transmission pipelines such as those for natural gas, oil, chemicals, environmental protection, urban pipelines, and gas pipelines, as well as in venting systems and gas storage devices, serving as opening and closing equipment. Suitable for long-distance pipelines in natural gas extraction and purification.