Pneumatic gate valve is made by Metals Valve is a typical wedge gate valve that uses two inclined seats and a slightly mismatched inclined gate that allows for tight shutoff, even against higher pressures. The inclined seats are designed 5° to 10° from the vertical plane, while the inclined gate can be designed with a close, but not the exact angle. When the seat and gate angles are slightly mismatched, either the seat or gate is designed with some free movement to allow the seating surfaces to conform with each other as the hand-wheel or actuator force is applied. API 600 is the standard specification for steel gate valves with flanged or butt-welding ends and bolted bonnet which is designed for heavy-duty applications such as petroleum refinery and related applications where corrosion, erosion, and other severe service conditions would indicate a need for full port openings, heavy wall sections, and large stem diameters. It is driven by pneumatic actuator .
Design & Manufacture Standards: API 600, API 6D, ASME B16.34, ISO 10434, ISO 14313; Pressure Test: API 598; End Connections: RF/ RTJ-ASME B16.5/ ASME B16.47 Series A & B, BW-ASME B16.25; Face to Face Dimensions: ASME B16.10.
(1)Wedge(disc): one-piece flexible wedge or solid wedge. Integral rib face design assures self-aligning of the wedge.
(2) Double-Stem Packing to assure low emission and tight stem sealing.
(3) A Lantern Ring is furnished at back seating for sealant injection or leakage-collection & drain.
(4) Bypass design to relieve the seating load prior to opening the valve at high pressure applications.
(5) OS&Y(Outside Screw & Yoke): the screw for raising or lowering the stem is located outside the valve body(rising stem).
(6) Live Load Packing: Belleville springs are employed to provide constant packing gland stress.
(7) Hard Faced Seating to assure durable wear resistance of the seating surface.