The movement of the parallel expanding gate provides a bubbletight mechanical seal to assure positive shutoff while reducing wear between the sealing surfaces and extending the valve life. Global valve and controls trunnion ball valves, double. A gate valve is the most common type of valve that used in any process plant. For buried service or offshore applications, contact factory. Solid particles cannot penetrate into the body, both when the valve is in the open or in the close position. Expanding gate valve features a nonrising stem with an expanding gate design to provide safe, dependable service in a variety of environments. Our patented single loadedspring sls stem seal design, used in saftseal slab gate valves and wkm powrseal double expanding gate valves, provides superior leak protection and a selfadjusting seal designed to reduce maintenance. The use of industry standard thread full length studs and nuts also allows easy replacement should these items be lost or in need of replacement. Because of their diversity of construction materials, trim offerings, and design combinations, gate valves are appropriate for a wide variety of applications. This design allows complete removal from the valve when service is required. Babcock supplies a 20 double wedge and double disc gate valve operated by electric actuator, for a special requirement received from a petronas refinery in malaysia. In service, these valves are either in fully open or fully closed position. Velan is a world leader in the design and production of a wide range of cast and forged steel gate, globe, check, ball, tripleoffset butterfly, knife gate, highly engineered severe service valves, and steam traps offering superior performance across all major industrial applications. It is a linear motion valve used to start or stop fluid flow.
The end result is an extremely heat resistant seal that is unaffected by line pressure or vibration. We produce gate, globe, check, ball, butterfly, knife gate, and engineered severe service valves and steam traps in sizes up to nps 64 dn 1600 and for services up to asme. The double block and bleed feature of this valve and the seats fixed in the body require always to provide a body pressure relief system. Dual expanding plug valves are designed and manufactured according to the following international codes and standards. In the first case, the two halves of the gate are pushed against the seats in the valve closed position by having an internal stop.
But solid slab valves as the one shown in figure 6 is. Through conduit gate valves are manufactured as per standard api 6d. Since 1842, is the leading company in industrial valve manufacturing for fluid control and vapor control technologies made in a wide variety of materials such as carbon and alloyed steels, austenitic and duplex stainless steels, nickel alloys, ductile iron, and bronze, just to mention a few, which are available as gate, globe, check, ball, pressure seal, awwa butterfly and plug valves, in the. Expanding gate forms tight positive mechanical seal. Proven technology for individual valve solutions worldwide. When the gate valve is fully open, the disk of a gate valve is completely removed from the flow. Through conduit double expanding gate valves are double block and bleed valves as they can grant zero leak towards the body cavity with pressure on the upstream and downstream side, even when the. The gate is attached and driven by thestem and a centralizer. Isv series gtds and gtde api 6d through conduit gate valves isv api 6d gate valve production range body size inches legend. The slopes are designed to cause the expansion of the gate in both open and closed positions with the valve closed, the gate provides a double barrier with the valve open, a fullbore conduit is isolated from. All dimensions are in inches, all weights are in pounds. Construction is available with single expanding or double expanding system. Through conduit double expanding gate valve rays flow. Double block and bleed capabilities internal pressure relieving through self relieving seats secondary sealant injection at seats and stems full port thru conduit for passage of pigs scv thru conduit expanding gate bidirectional with preferred pressure side expanding mechanical gate forms positive tight sealing seals at low and high pressure.
Flexible wedge, split wedge, slab gate and doubledisk configurations cover a range of requirements to. The parallel expanding gate design provides a tight mechanical seal which is normally unaffected by pressure. Double isolation plug valves flowserve corporation. The protected seatface design of double expanding and slab gate. It is available in flange or thread ends in standard. The unique feature of the expanding gate valve is the double isolation and bleed. For category e, f, h, j and k valve gearing dimensions, contact factory. The wkm powrseal gate valve is a premium through conduit expanding gate valve. Wkm powrseal expanding gate valve schlumberger products. Gate valves are designed to meet requirements of ansi b16. Petrolvalves double expanding gate design permits full operability in any service and design condition. Double expanding gate tiv valves doubleexpandinggate. This full bore, throughconduit gate valve features a mechanically sealing gate to assure. This special design permits that the sealing load increases as the differential pressure across the disc increases too, thus providing a tight seal throughout the entire range.
But solid slab valves as the one shown in figure 6 is normally not accepted as a double isolation valve. Flexible wedge, split wedge, slab gate and doubledisk configurations cover a range of requirements to meet any user need, from general service to severe conditions with gross thermal transients or dualphase fluids. The slopes are designed to cause the expansion of the gate in. The slab gate valve is the workhorse of pipeline gate valves.
The wkm powrseal valves throughconduit design provides these specific advantages resulting in reliable performance and long life. Velan is a world leader in the design and production of a wide range of cast and forged steel gate, globe, check, ball, tripleoffset butterfly, knife gate, highly engineered severe service valves, and steam traps. From the most common application to the most severe, velan has a solution. This is double expanding gate valve animation by chris beck on vimeo, the home for high quality videos and the people who love them. The compact expanding gate valve is constructed for increased reliability and ease of operation and maintenance. Through conduit double expanding gate valves valve world. Velan offers one of the most comprehensive valve product lines available from any manufacturer. Double expanding gate valves have a gate wedge split into two parts, mainly. From hightemperature coking units to food and pharmaceutical services, gate valves can be trusted to reliably perform. In the first case, the two halves of the gate are pushed against. The yoke sleeve is of forged stainless steel material. Gwc italia proven technology for individual valve solutions worldwide 8 api 6d through conduit slab gate valve stem bonnet gate body bonnet stud and nut floating seat with energized oring provides constant contact with gate fullbore, throughconduit design reduces turbulence and pressure drop slab gate valve design. Gwc italia proven technology for individual valve solutions worldwide 6 api 6d through conduit slab gate valve features main features slab gate valve n full bore for pigging.
S slab gate e expanding gate special order expanding gate. In the first case, the two halves of the gate are pushed against the seats in the valve closed position by having an internal stop acting on one of the two halves. The positive, mechanical seating force of the lockinplace seals holds with zero leakage. Double block and bleed capabilities internal pressure relieving through self relieving seats secondary sealant injection at seats and stems full port thru conduit for passage of pigs scv thru conduit. It is available in flange or thread ends in standard bore sizes from 116. The parallel expanding gate design provides a tight mechanical seal which is normally unaffected by pressure variations. Expanding gate valve and m303 fabricated slab gate valve. Gate valves are designed with a sealing unit to provide a tight seal around the stem. Slab and expanding gate valvesslab and expanding gate valves. Gate valves api 600 a world leader in valves velan. Gate valve through conduit gate valve double expanding.
Bel valves pipeline gate valves double expanding gate valve double expanding gate valve material specification trim material class trim material code tc1 ta1 ts1 material carbon steel, nace stainless steel, nace stainless steel, nace temperature range 19. Velan products cast steel bolted bonnet valves gate. This full bore, throughconduit gate valve features a mechanically sealing gate to assure positive shutoff. Through conduit double expanding gate valves are double block and bleed.
The use of industry standard thread full length studs and nuts also allows. Petrolvalves has been manufacturing double expanding gate valves since. Bolted bonnet, pressure seal and cryogenic designs are available. Atv takes full responsibility in selecting the most suitable size for operating. The wkm powrseal gate valve is the ultimate choice for full port, through conduit, positive shutoff gate valves. For motorization contact factory for correct gear model and valve outline dimensions. Through conduit double expanding gate valve rays flow control. Through conduit double expanding slab gate valve specifications. Double block and bleed animation for industrial valve company. Expanding gate valves our cast body expanding gate valve is designed for use in liquid service applications.
Double expanding gate valves are made by two sliding pieces. The doubledisc parallelseat gate valve is often favored for hightemperature steam service because it is less likely to stick in the closed position as a result of change in temperature. Through conduit double expanding gate valves are double block and bleed valves as they can grant zero leak towards the body cavity with pressure on the upstream and downstream side, even when the valve is fully open. Slab gate valves thruconduit slab style gate valves are a popular item for the pipeline and tank farm industries. The valve can be trimmed to meet most specifications handling a wide range of products and services. Reliable, tight shutoff and lowpressure drop operation characterize the flowserve range of gate valves. The through conduit double expanding gate valve comprises of a two piece wedged shape assembly consisting of a gate and a segment. In the second case the same expansion is also obtained in the valve open position. Applications duraseal is an excellent choice for applications that require frequent isolation and testing of gas or liquids. Double isolation and bleed dib1 both seats bidirectional. Subsea gate valves the bel valves subsea gate valve range provides the ideal solution for heavy duty onoff applications in the challenging subsea environment and can be supplied in bore sizes from. Cast steel with outside screw and yoke, rising stem, nonrising handwheel, and removable yoke sleeve. Types of gate valve and parts a complete guide for engineer. The seats are press fit into the body to affect a metaltometal bodyseat seal.
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