WINDMILL steel gate valve
Steel gate valve
Design and Manufacture: Cast steel gate valve to API 600 (ISO 10434) or API 6D; Cast stainless steel gate valve to API 603 or API 600; Forge steel gate valve to API 602.
Inspection and Test: API 598, API 600 or API 6D.
End flange dimension: ASME B 16.5 ( for NPS≤24）； ASME B 16.47 series B、API605 or ASME B 16.47 series A、MSS SP-44(for NPS＞24).
BW end dimension: ASME B 16.25.
Socket-weld dimension: ASME B 16.11.
Face to face and end to end:ASME B 16.10.
Pressure-temperature ratings:ASME B 16.34.
Packing Seal
Molded flexible graPhite is used for Packing material PTFE or combined Packing material can be al so used if being requested by the customer. The inte rnal surface of the stuffing box, of which area is contacted with the Packing, is of excellent finish (Ra3.2um). The stem surface, contacting With the Packing should be rolled and Pressed after being P recisely machined, so as to reach to the
high finish and comPactness (Ra0.8um) and ensure the reliable tightness of the stem area.
Belleville spring loaded packing imacting system
If being requested by the customer，the Belleville sP ring loaded packing impacting system can be adopted for enhanclng the durability and reliability of the packing seal.
Back seating desing
All our gate valves have the back seating design In most cases,the carbon steel gate valve is fitted with a renewable back seat. Fo stainless steel gate valve, the back seat is machined directly in the bonnet or is machined after welding When the gate valve is at fully open position, the sealing of the back seat can be very reliable However, as per the requirement ofAP1600, it is not advisable to add or change packi ng by the mean of back seating when the valve is ressure containing.
Seal
For carbon steel gate valve, the seat is usually forged steel. The sealing surface of the seat is spray welded with hard alloy specified by the customer, Renewable threaded seat is used for NPS 10 gate valves, and welded on seat can be also optional if being requested by the customer, Welded on seat is used for NPS 10 carbon steel gate valves. For Stainless steel gate valve, integral seal is usually adopted, or to weld hard alloy directly integrally. Threaded or welded on seat is also optional for stainless steel gate valve if being requested by the customer.
