Through conduit double expanding gate valve rays flow control. In such a design, a wedge slides cross a general passageway in order to control fluid flow like a sliding gate hence, the name. Slab and expanding gate valvesslab and expanding gate valves tm. Seat faces are outside the flow stream and in full contact with the gate, in both fully open and fully closed positions. Handwheel the spoked handwheel is fabricated from steel pipe. Through conduit double expanding gate valves are double block and bleed valves as they can grant zero leak with pressure on the upstream and downstream side towards the body, even when the valve is fully open. The full round bore through conduit design allows the fluid to flow. The actuator 9 includes an assembly of dual pistons 61,75 which are adapted to be driven by fluid pressure in one direction to operate the valve.
But solid slab valves as the one shown in figure 6 is normally not accepted as a double isolation valve. The movement of the parallel expanding gate provides a bubble tight mechanical seal to assure positive shutoff while reducing wear between the sealing surfaces and extending the life of the valve. Aug 20, 1985 an expanding gate valve 10 provided with a piston type pneumatic powered actuator 40 for opening and closing the valve wherein the actuator piston 54 is adapted to be driven by fluid pressure in one direction to operate the valve but is returned by spring means 63, 64 when the pressure is removed. Numerical simulations are carried out to optimize any project solution. 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. You will receive a pdf with stock valve pricing emailed to. This increase in volume reduces the pressure trapped in the body to a pressure less than initial line pressure. Through conduit expanding gate gate valves fluitek. G6d024 this specification defines the requirements for the design, manufacturing, assembly, testing, and documentation of ball, check, gate, and plug valves for application in pipeline and piping systems for the petroleum and natural. Through conduit slab and double expanding gate valves. Expanding gate valves our cast body expanding gate valve is designed for use in liquid service applications.
Pdf on sep 1, 2017, marco gennari and others published emergent redo surgery for double self. The parallel expanding gate design provides a tight mechanical seal which is normally unaffected by pressure variations. Suprseal expanding gate valve product specifications the lvs suprseal gate valve is an api6d certified, made in the u. Gate valves are designed with a sealing unit to provide a tight seal around the stem. The internal forces of the medium work with the seating mechanisms. It is available in flange or thread ends in standard bore sizes from 116. The end result is an extremely heat resistant seal that is unaffected by line pressure or vibration. The through conduit service implies the continuity of fluid flow conduit, excluding any dirt accumulation in the body cavity. In the first case, the two halves of the gate are pushed against the seats in the valve.
Med double expanding gate valves in one piece unibody with. Slab gate valve through conduit rising stem design walworth slab gate valves also named through conduit gate valve are manufactured and tested in accordance with the api6d standard. Williams valve manufactures api 6d pipeline gate valves in both slab and expanding gate designs. Double block and bleed capability and high robustness are standard feature of this seat design. Suprseal expanding gate valve louisiana valve source.
This provides a superior valve in demanding applications including those requiring zeroleakage in double block and bleed service. Expanding gate valves expanding gate valves are high performance gate valves that possess functions. Gate valves are designed to meet requirements of ansi b16. Isv parallel expanding gate design achieves tight mechanical seal under variations in the line pressures by providing opposing gate forces to the upstream and downstream parallel seats at the end of the open and closed position. A piston type pneumatic powered actuator 9 for operating a valve 10 of the expanding gate type wherein velocity of the pistonstem gate drive train is maintained substantially constant in the latter stage of the actuator stroke. Atv is a worldwide affirmed manufacturer of valves and actuators for the most demanding applications in the offshore industry, such as deep and ultradeep water, high pressure high temperature, highly corrosive services. These valves are designs and manufactured with a full bore. Slab and expanding gate valvesslab and expanding gate valves. Slab gate valve through conduit gate valve has been designed as per api6d standard, including soft sealing slab gate valve, metal to metal sealing slab gate valve and expanding slab gate valve. Onoff service valve, throughconduit, expanding gate design, rising stem cast or forged body, bolted bonnet constructions, full or reduced bore, bidirectional. Ansi 150 through ansi 2500 global valve and controls high performance trunnion ball valves. Expanding gate valve with fluidpowered actuator joy.
Gate valve description gate valves are primarily designed for onoff services when a straightline flow of fluid and minimum restriction is desired. The expanding gate valve is a high performance gate valve with outstanding features. Double expanding gate valves are made by two sliding pieces. Us4585207a expanding gate valve with pneumatic actuator. The protected seatface design of double expanding and slab gate valves eliminates degradation of the seat face caused by debris in the process fluid, which makes them ideal for liquid service. Gate valve through conduit gate valve slab gate valve. Trunnion ball valve, topentry, double block and bleed with self relieving seats, anti. Through conduit double expanding gate valve rays flow. This type of valve includes in itself the features of a through conduit service and of a standard gate valve with a parallel seating surfaces. The closure member of gate valves either stops or allows flow through the valve and acts somewhat like the opening or closing of a gate and is called, appropriately, the gate valve. The mechanical characteristics make the scv wedge gate valve are ideal for bidirectional total flow system openshutoff applications with.
The double disc gate valves manufactured by ludlowrensselaer valve division utilize the bottom wedging principle, avoiding jamming or scoring due to premature wedging in the partiallyopen position. Gate valves standard configurations basic cryogenic bellow seal gate valve description gate valves are primarily designed for onoff services when a straightline flow of fluid and minimum restriction is desired. 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. Bel valves through conduit expanding gate valve enables double block and bleed dbb functionality to be achieved within one single valve assembly, as opposed to the two conventional slab gates that would otherwise be required. During operation the gate assembly travels freely between the seal surfaces which will reduce the wear risk and prolong the valve service life. Global valve and controls trunnion ball valves, double.
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. Reliable, tight shutoff and lowpressure drop operation characterize the flowserve range of gate valves. Both types are full bore, bidirectional, capable of double block and bleed sealing, and ideal for pipeline pigging operations. Through conduit expanding gate valve through conduit expanding gate valves for surface applications bel valves through conduit expanding gate valve enables double block and bleed dbb functionality to be achieved within one single valve assembly as opposed to the two conventional slab gates that would otherwise be required. Neways expanding gate valves are in compliance with api6d and provide a superior bidirectional torque based mechanical seal. Array 2,0005,000 psi expanding and slab gate valves are available with either cast or forged steel valve bodies. In the second case the same expansion is also obtained in the valve open position. A doubledisk parallel gate valve has two parallel disks that are forced, on closure, against parallel seats by a spreader. The through conduit double expanding gate valve comprises of a two piece wedged shape assembly consisting of a gate and a segment. From hightemperature coking units to food and pharmaceutical services, gate valves can be trusted to reliably perform. Bolted bonnet, pressure seal and cryogenic designs are available. Construction is available with single expanding or double expanding system. This is double expanding gate valve animation by chris beck on vimeo, the home for high quality videos and the people who love them. Array 10,00015,000 psi slab gate valves come standard with forged steel valve bodies and bonnets.
The double disc 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. Isvs pipeline style gate valves are manufactured in strict accordance to api 6d under. Through conduit expanding gate gate valves fluitek orsenigo. Dual expanding plug valves are designed and manufactured according to the following international codes and standards. One of the most significant characteristics of this type of valves is its. Double expanding gate tiv valves doubleexpandinggate. The through conduit service implies the continuity of fluid flow conduit, excluding any dirt accumulation in. The slab gate valve is through conduit and piggable. The valve can be trimmed to meet most specifications handling a wide range of products and services. They are ideal for a variety of applications including leased automated custody transfer lact, product metering, aviation fueling, product isolation, blend. The valves adopt expanding gate operating principal to give a tight and positive seal against both upstream and downstream seats under a wide range of pressures and environmental condition. Like the rest of our flow control solutions, gvc offers cast steel valves from ansi 150 through 2500.
Double expanding gate valve forged steel flat gate valve. Subsea through conduit double expanding gate valve. Solid particles cannot penetrate into the body, both when the valve is in the open or in the close position. Gvc offers a complete line of threaded end and socket weld end valves with pressures up to 6000 psi. Gate valve types, construction, applications and advantages. Wkm powrseal expanding gate valve schlumberger products. Bfe reserves the right to change designs, dimensions or specifications w ithout notice.
Petrolvalves has been manufacturing double expanding gate valves since the late. Home products conduit gate valve through conduit expanding gate valve through conduit expanding gate valve camtech through conduit gate valves offer increased value by incorporating advanced design features. The wkm powrseal valve s throughconduit design provides these specific advantages resulting in reliable performance and long life. The gate is attached and driven by thestem and a centralizer helps in retaining the gate segment assembly until sealing through expansion is required. Gate valve through conduit gate valve double expanding. Positive sealing is achieved in both high and low pressure. The wkm powrseal gate valve is a premium through conduit expanding gate valve. Throughconduit expanding gate valve calvary valve inc. The seats are press fit into the body to affect a metaltometal bodyseat seal. This video explains the principle of operation for orions expanding gate valve. Sep 05, 2019 download a pdf of our walworth spotlight sheet. This full bore, throughconduit gate valve features a mechanically sealing gate to assure positive shutoff. The closure member of gate valves either stops or allows flow through the valve and acts somewhat like the opening or closing of a gate.
In lowpressure and lowtemperature systems such as fire protection systems water piping or water distribution pipelines, flanged gate valves are commonly used. Emissions after 500 cycles at ambient and 350 f issued by yarmouth research and technology lab for 8 inch class 300 gate valve after 500 cycles the measurement result was less than 50 ppm. Double disc gate valves also utilize the contained pressures for tight shutoff. Slab gate valve forged steel flat gate valve, api 6d, 4in. This type of valve is very useful in transportation pipe lines for gas, crude oil and oil products. Orion through conduit expanding gate valve youtube.
1536 717 276 102 733 573 26 1318 145 413 239 1467 581 828 565 87 823 229 570 1615 612 999 579 887 1074 470 661 882 1311 360 1332 1180 195 744 49 143 232 666 518 346 569 418 1395 547