GATE VALVE

GATE VALVE : STANDARD : ANSI, JIS, PN SIZE : 1/ 2 " 54 " CLASS : 150, 300, 600, 900, 1500, 2500 JIS : 10K, 20K PN : 10, 16, 20, 40 BODY : A 216 WCB FORGED STEEL A 105 CAST IRON DUCTILE CAST IRON STAINLESS STEEL SUS 304 SUS 316 ALLOY STEEL DESIGN AND MANUFACTURING: API 600 ( ISO 10434) bolted bonnet steel gate valves for petroleum and natural gas industries API 602 Steel Gate, Globe and Check Valves for Sizes DN 100 and Smaller for the Petroleum and Natural Gas Industries API-6D ISO 14313: 1999, petroleum and natural gas industriespipeline transportation systems-pipeline valves ASME B16.34 VALVES - flanged, threaded, and welding end BS 1414 Steel wedge gate valves ( flanged and butt-welding ends) for the petroleum, petrochemical and allied industries. INSPECTION AND TEST: API 600 ( ISO 10434) bolted bonnet steel gate valves for petroleum and natural gas industries API-6D ISO 14313: 1999, petroleum and natural gas industriespipeline transportation systems-pipeline valves API 598 valve inspection and testing FLANGE DIMENSION: ASME B16.5 pipe flanges and flanged fittings ASME B16.47 large diameter steel flanges: nps 26 through nps 60 MSS SP 44 steel pipeline flanges WELDED OR THREATED ENDS: ASME B16.25 buttwelding ends ASME B16.11 forged steel fittings, socket-welding and threaded ASME B1.20.1 pipe threads general purpose FACE TO FACE AND END TO END: ASME B16.10 face to face and end-to-end dimensions of valves API-6D ISO 14313: 1999 petroleum and natural gas industries pipeline transportation Systems-pipeline valves * Other standards/ materials upon request * DESCRIPTION GATE VALVE* ANSI Std. Gate valves Class 150LB-2500LB SIZE 1/ 2" ~ 60" DIN Std. Gate valves DN50~ DN1200, PN16~ PN420 JIS Std. Gate valves DN15~ DN800 10K~ 40K BS Std. Gate valves DN15~ DN800, PN16~ PN420 Design & Manufacture Std. API600, API 6D, ASME B16.34, API603 BS1414, DIN3352, BS1984 etc. Face to Face Std. ASME B16.10, API 6A, , DIN3202, EN558, BS2080, MSS SP-81, JIS B2002, NFE29-305, ISO5752 etc. End Connection Std ASME B16.5, ASME B16.11, ASME B1.20.1, ASME B16.25, EN1092-1, DIN2501, DIN2543-2550 , JISB2212-JISB2214, JIS2220 ( Connection type: RF, FF, RTJ, BW, SW, NPT, ) Test Standard API598, API 6D, BS 6755, DIN3230, EN12266 , JIS B2003 Operated Type Handwheel, Bevel Gear , Pneumatic, Electric, Bare stem with ISO5210 top mounting pad Material Carbon Steel: A216 WCB, WCC, WC1, ASTM A105 Stainless Steel: A351 F8( F304) , CF8M( F316) , CF3( F304L) , CF3M( F316L) , CF8C( F347) , F321, F321H, CK20 Alloy Steel: Monel 400, Monel K500, alloy20, 904L, CN7M, Inconel, Hastelloy B& C, Titanium alloy Duplex Stainless Steel: A351 CN7M( B473) , CD4MCu( F50) , CK3MCuN( F44) , CG8M, A890-1A, 4A, 5A, 6A, A182 F44, F50, F51, F53, F310 Low temperature steel: A352 LCB, LCC, LCA, LC3, A350 LF2, LF3 High temperature steel: A217 WC6, WC9, WC5, WC11, C5, C12, C12A, A182 F22, F11 , F5, F9, Bronze, Nickel aluminum bronze( NAB) , Gunmetal: B148 C95500, C95800, C95400, C83600, C92200, ASTM B62, B61, B150 C63200 , DIN Material GS-C25/ 1.0619 1.4408, 1.4308, C22.8 Gate valve catalogue Gate valves catalogue DIN Gate valves Catalogue Special Gate Valves Except for common gate valves, we also produce cryogenic gate valves, bellow sealed gate valve, Jacketed gate valves, Through Conduit Gate Valve, Parallel Slide Gate Valve, Knife Gate Valve, High-Temperature Gate Valve, high pressure valves etc. GATE VALVE DESIGN Gate valve Bonnet Design Bonnets provide leak proof closure for the valve body. Gate valves may have a screw-in, union, or bolted bonnet. Screw-in bonnet is the simplest, offering a durable, pressure-tight seal. Union bonnet is suitable for applications requiring frequent inspection and cleaning. It also gives the body added strength. Bolted bonnet is used for larger valves and higher pressure applications. Another type of bonnet construction in a gate valve is pressure seal bonnet. This construction is adopted for valves for high pressure service, typically in excess of 15 MPa ( 2250 psi) . The unique feature about the pressure seal bonnet is that the body bonnet joints seals improve as the internal pressure in the valve increases, compared to other constructions where the increase in internal pressure tends to create leaks in the body-bonnet joint. Gate valve Disc Design Solid or Flexible Wedge or parallel disc . Gate valve Stem Design Gate valves are characterized as having either a rising or a non-rising stem. Rising stems provide a visual indication of valve position. Non-rising stems are used where vertical space is limited or underground. The stem is of one-piece wrought material, welding fabricated is not permitted for valves. The connection of the stem to the disc is ? T? type. The strength of the connecting area is higher than that of the T threaded part of the stem. The strength test of the area conforms to API 591. Gate valve Seat Design For carbon steel gate valve, the seat material is usually forged steel. The sealing surface of the seat is overlay welded with hard alloy specified by customers. Renewable threaded-in seat ring is used for gate valves NPSd10, and welded-on seat is optional and can be used if required. Welded-on seat is used for carbon steel gate valves NPS d10. For Stainless steel gate valve, the seat is integral or hard alloy welding integrally to the body. Threaded-in seat ring or welded-on seat is also optional for stainless steel gate valve. Gate valve Back Seat Design All our gate valves have the back seating design. In most cases, the carbon steel gate valve is fitted with a renewable back seat while for stainless steel gate valves, 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 is very reliable. However, according to API 600, the packing shall not be added or changed under line pressure. Body-Bonnet Gasket Design Carbon steel or stainless steel + flexible graphite combined gasket is used for Class150 gate valve; stainless steel + flexible graphite spiral wound gasket for Class 300 gate valve; stainless steel + flexible graphite spiral wound gasket for Class 600 gate valve, and ring type joint gasket is optional for Class 600 gate valve; ring type joint gasket is used for Class 900 gate valve; pressurized seal design is used for Class1500 to Class 500 gate valve. Gate valve Packing Seal Design Molded flexible graphite is normally used for packing material. PTFE or combined packing material can be also adopted if required. The internal surface of the stuffing box, of which area contacts the packing, is fine finished ( Ra 3.2 m) . The stem surface, contacting the packing, should be rolled and pressed after being precisely machined, so as to reach to high finish and compactness ( Ra 0.8 m) and to ensure the reliable tightness of the stem area. Gate valve Stem Nut Design Usually, the stem nut is made of copper alloy or ASTM A439 D2. 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 underside of the stem nut in order to minimize the open and close torque of the gate valve. Gate valves Operation type Hand wheel or gearbox operator are usually applied, if required, chain wheel is available. Top flange dimension according to ISO 5211 is available for valves to be actuated. Belleville Spring Loaded Packing If required, Belleville spring loaded packing can be applied to enhance the durability and reliability of the packing seal. Gate Valve distributors, Gate Valve Suppliers, ansi gate valves, knife gate valve, api600 gate valves, BS1414 Gate valve, ASME B16.34, NACE MR0175, gate valves catalog