-Design and Manufacture：Cast steel gate valve to API 600(ISO 10434)or API 6D、API 600；-Inspection and Test：API 598，API 600 or API 6D
-End flange dimension：ASMEBl65ffor、API 6050fASMEBl647seriesA、MSSSP一44(for NPS>24)
-BW end dimension：ASME B16 25
-Socket—weld dimension：ASME B16 1 1
-Face to face and end to end：ASME B16 10
-Pressure—temperature ratings：ASME B16 34
- Carbon steel or stainless steel + flexible graphite combined gasket is usedforClassl50 gate valve；Stainless steel + flexible graphite -wounded gasket is used for Class 300 gate valve；Stainless steel + flexible graphite wounded gasket is used for Class 600 gate valve and ring joint gasket is also optional for Class 600 gate valve；Ring Joint gasket is used for Class 900 gate valve; Pressurized seal design is used
-forClassl500一Class2500 gate valve
-Molded flexible graphite is used for packing material PTFE or combined packing material can be also used if being requested by the customer The internal surface of the stuffing box，of which area is contacted with the packing，is of excellent finish(Ra 3 2 u m)The stem surface，contacting with the packing，should be rolled and pressed after being precisely machined．so as to reach to the high finish and compactness(Ra 0 8 u m)and ensure the reliable tightness of the stem area
-The body and bonnet ofClassl50～Class 900 gate valves are usually connected
-All our gate valves have the back seating design In most oases，the carbon steel gate valve is fitted with a renewable back seat For 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 of API 600．it is not advisable to add or change packing by the
mean of back seating when the valve is pressure containing Usually．the stem nut is made of ASTM A439 D2 It is also can be made of copper ally if being requested by the customer For large sized
-gate valves(NPS 10 for Class 150，NPS 8 for Class 300．NPS 6 for Class 600，NPS 5 for Class 900)，rolling bearing is fitted at the two sides of the stem nut in order to minimize the open and close torque of the gate valve
-The stem is of integral forged design。 The minimum diameter of the stem shall per the standard requirement The connection of the stem and disc is T type The strength of the connecting area is bigger than that of the T threaded part of the stem The strength test of that area conforms to API 591
-Welded on seat is used for NPS≤12 carbon steel gate valves For Stainless steel gate valve，integral seat 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
-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
-Besides the common gate valves，Our company。s also makes cryogenic gate valve，Jacketed Gate Valve，Bellow Sealed Gate Valve, EXtension Stem Gate Valve for underground application，etc
Our products are very competitive, feel free to contact us and offer you the fastest
http://www.wlvalves.com/Cast-Steel-Gate-Valve-46.htmlOur products are very competitive, feel free to contact us and offer you the fastest
