Soft Seal Orbit Plug Valve

Size Range: DN50~900mm / NPS2"~36"

Pressure: PN0.6~15.0MPa / Class150~900

Material: A105, LF2, F304, F316, F304L, F316L, F51, WCB, LCB, WCC, CF8, CF8M, CF3, CF3M, A890 4A etc

Operation: Manual, Worm Gear, Hydraulic, Electric, Pneumatic

Standard: API, ANSI, DIN, EAC, JIS, CE, ISO, EN, GB

Applications: Oil And Gas, Chemical Industry, Electric Power, Boiler Feed Water, Steam System, Mining And Metallurgy, Harsh Working Conditions

End connection: RF RTJ BW

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Description

It's stipulated in API 6D:"AII valves with double seal must has a pressure difference relief function when used in a liquid medium". The relief pressure difference is generated from the changes in the ambient temperature. In the normally-closed state, the cavity pressure of the valve with double seal can increase rapidly due to the temperature rise, and if such a pressure difference is not bled promptly, it can have a serious impact on the valve's operation.

Generally, the double seal rail valve with manual operation has the following two pressure relief systems.

(1)Manual pressure relief system: The manual pressure relief system is generally a needle valve mounted on the end capfsee. When the medium is a liquid which can be slightly bled into the atmosphere, it can be equipped with such a pressure relief system.

(2)Differential thermal pressure relief system: The differential thermal pressure relief system is a pipeline system with a one-way valvefsee. The needle valve 1, the tee 1, the one-way valve 1, the tee 2 and the needle valve 3 make up the diferential thermal pressure relief system In the system, the needle valve 1 is normally-closed and the needle valve 3 is normally-open. When the medium is a liquid which cannot be bled into the atmosphere, it shall be equipped with such a pressure relief system (generally pressure relief to the upstream pipeline).