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gate valve with back seat

Crane Figure 636E Gate Valve. Non-Rising Stem. Union Bonnet. Solid Wedge Disc. Threaded Ends. Full Ports. Back Seat. 410 Stainless Steel Seat Rings. MSS SP-80, Type I. 300 psi Steam, Basic Rating. 1000 psi Cold Working Pressure 1/4 to 2 - (6mm - 50mm). Product Data Sheet.

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GROVE G4N Gate Valves Schlumberger

OS&Y bonnet and back seat. Reverse acting. Normal acting. Seat skirts for dirty : fluid application: G4N gate valves can be supplied with protection skirts when the valves : ... Through-conduit, double block-and-bleed slab gate valves with fully protected seat faces …

US4682757A Secondary backseat for gate valve Google

A rising stem expanding gate valve including an improved metal-to-metal stem backseat seal assembly. An axially slidable seal ring is press fit onto the valve stem and is adapted to seal against a counterbored bonnet seat portion to provide a secondary metal-to-metal stem to bonnet seal. The seal ring is allowed to move a limited axial distance on the valve stem such that upon upward axial ...

Backseat assembly for an expanding gate valve Cooper

Sep 07, 1994 11. The gate valve of claim 1 further including an elastomeric sealing member housed on said stem member for sealingly engaging said sealing member. 12. The gate valve of claim 1 wherein said seat further compresses said biasing member upon said stem and said first segment reaching the upper limit of their travel within said bore. 13.

GATE VALVES Bonney Forge Corporation

The stem is forged steel and part of the valve trim. It contains an integral back seat shoulder, which mates with the integral backseat of the bonnet. The stem is designed to the basic dimensional requirements of the applicable specifications such as API 602. 9. GLAND AND FLANGE. The gland, gland flange assembly utilizes a separate, two piece ...

Gate Valve Conval Inc.

This valve may be installed in any position and is suitable for handling nearly any fluid type. This valve provides no compensation for adjusting seat alignment due to thermal expansion or pressure loads. These valves are most common in low-to-moderate pressure and temperature applications. Flexible Wedge Gate Valve.

Gate Valve an overview ScienceDirect Topics

Feb 01, 2019 A gate valve is generally used to completely shut off fluid flow or, in the fully open position, provide full flow in a pipeline. Thus it is used either in the fully closed or fully open positions. A gate valve consists of a valve body, seat and disc, a spindle, gland, and a wheel for operating the valve.

Classification of Gate Valves Gate Valve Disk Stem

The three-way valve is positioned to the high pressure side of the gate valve when closed to ensure that flow does not bypass the isolation valve. The high pressure acts against spring compression and forces one gate off of its seat. The three-way valve vents this flow back to the pressure source. Gate Valve …

Valve Terminology Glossary Valtorc

Back seatA shoulder on the stem of a gate or globe valve which seals against a mating surface inside the bonnet to prevent leakage of media through the bonnet stuffing box when the valve is fully opened. BallThe closure element of a ball valve. Ball valveA valve using a spherical closure element which is rotated through 90 to open and close ...

GATE VALVES BFE

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. ... Back-seat design. Full die forged structure for all pressure containing parts. Best-in-Class CV values. Self aligning two piece packing gland.

Valve Back Seat Test Google Groups

Jan 20, 2012 Some of the valves are provided with backseat features. The backseat features enables the maintenance crew to replace the gland packing even when the system is under pressure. i.e. the valve is opened fully to 100 % and the conical shape of the stem touches tightly against seat construction ( back seat ) in the valve body which seals off the fluid passing to gland packing area.

Ask the Expert Chesterton

take the valve off the back seat. How are the back seats tested for sealing ability? API 598, section 6.2, de-scribes the pressure test of the backseat to be done as part of the valve inspec-tion and testing process for pro-duction valves. The procedure is pretty basic; the valve is fully opened and tightened on the backseat. The packing gland is

Gate Globe amp Check Valves

Disc, seats and back-seat (for gate and globe valves) are hard-faced with Stellite 6 or equivalent. As a standard, the valves are offered with a hard-facing thickness of 1.6 mm to ensure long and trouble-free service life. Hard-faced Trim. 9 The disc mechanism comprises two independent discs, a disc carrier and

Back seat test in gate valve Engineers Edge Engineering

May 19, 2013 Back seat test in gate valve You will have to register or login (See top or bottom of page) before you can post a message or view images: click the appropriate link to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Forged Steel Gate Valve Forged Steel Valves Manufacturer

Back seating feature facilitates repacking of the stuffing box on line with the valve in fully open position. Stellited Wedge (Gate), Seat Ring & Back Seat can also be offered on special request. Material of …

G7 Fabricated Gate Valves GROVE Valves

Fabricated Gate Valve product line. Drawings shown are typical. The design of specific valves may vary slightly from the typical drawings. The Grove “G7” Fabricated Gate Valve is a through-conduit slab gate valve. It utilizes two floating seats to provide a complete seal with the gate…

GATE VALVE Leading Valves Design and Manufacturer

Seat rings are designed to greatly reduce and/or prevent any turbulence and avoid damages due to the corrosion. Seat rings for gate valves are typically made from forged steel. Renewable threaded seat is used for gate valves with NPS ≤ 10” while welded on seat is used on larger valves. St em Gland Packing Lantem B ackseat Gasket Bonnet Stud ...

why must gate vale must be open amp ball valve half open

Mar 03, 2003 - Gate valve full open (and on the back seat) to keep test pressure off the packing gland. - Globe valve full open (and on the back seat) to keep pressure off the packing gland. - Ball valve part open to pressurize the body cavity (full open doesn't pressurize the …

Introduction to Gate Valve The Process Piping

Apr 21, 2020 Gate valves are used to shut off the flow of fluid by inserting a rectangular gate or wedge into the path of a flowing fluid. Gate valves require very little space along the pipe axis and hardly restrict the flow of fluid when the gate is fully opened enabling gate valves to offer straightway flow with very little pressure drop.Gate valves are mostly used with larger pipe diameters (from 2 ...

Gate Valve Sw China Sw Gate Valve Manufacturer

The rolled-in seat design of ZECO SW gate valve ensures tight and effective seat assembly; 3. A positive backseat, high quality packing material and improved stuffing box design ensure tighter stem seal; 4. ZECO can provide or customize gate valves of various forged materials and connection modes according to customer's working conditions.

Gate Valve for Piping API 600 602 603 Projectmaterials

Sep 20, 2017 Gate valves have forged bodies for bore sizes below 2 inches (API 602/BS 5352), and cast bodies for larger sizes (API 600, API 603, API 6D). DEFINITION. Gate valves are on-off valves to open and close the flow of the fluid in a pipeline. The valve is opened and/or closed by the vertical movement of a disc on the valve’s seat.

Gate Valve Volfram Systems

Back Seat Arrangement: The back seat is designed to relieve back pressure on the stem packing when fully seated. Seating Surface: Gate valves can be offered with stellite seat, if specified. Stellated seat ring provides increased resistance to ware, abrasion and erosion of the sealing surface.

Gate Valves DHF Series Fire Resistant Gate Valves

6FA version available for Dril-Quip split gate valves; API 6FA Features: Components of a pressurized valve can withstand a half-hour burn and cool down and one-time operation without significant leakage; The Stem packing is made up of high temperature Teflon and metal back up ring that can withstand the heat of a half-hour burn.

gate valve seats gate valve seats Suppliers and

6,551 gate valve seats products are offered for sale by suppliers on Alibaba.com, of which valves accounts for 72%, machinery engine parts accounts for 1%, and intake and exhaust valves & valve lifter accounts for 1%. A wide variety of gate valve seats options are available to you, such as diesel.

Gate valves Stemat Jansen

The STEMAT-JANSEN Gate Valve have a wedge that moves linearly and perpendicularly to the flows at the seatings rings level. The wedges can be monobloc or flexible. The outside sealing is obtained with a gland- packing The Gate Valve are here to let or to stop any liquid medium or gas.

Gate Valve GMS Interneer

The Cameron FLS-S gate valve was designed for API 6A application using features from our FLS gate valve model, including forged construction, metal-to-metal sealing, slab-style gate, stem seal, and the seat design. The feature most beneficial of the FLS-S gate valve’s split gate design is the ability to perform a single dual-seat seal test. The split gate design is available for all FLS and ...

Gate valve GG25 cast iron outside stem stainless

Gate valve – GG25 cast iron – outside stem – stainless steel Seat – Fig. 013/31 PN10. Material : Cast iron. Type : Flat body DIN standard Outside stem. See Technical datasheet I am interested. Scope : For non-agressive medium. Pression nominale maxi : 10 bars.

Carbon and Low Alloy Steel Valves KITZ

Body seat rings of KITZ cast steel valves are mounted on the valve body by seal welding as shown in the typical examples of gate valves illustrated below. Unless specifically requested in advance, mounting of body seat rings

China API 600 Corrosion Resistant Acid Resistant Super

Renewable Seat Gate Valve, Backseat Gate Valve, Stellite Trim Gate Valve manufacturer / supplier in China, offering API 600 Corrosion Resistant Acid Resistant Super Duplex Stainless Steel A890 A995 4A 5A Bolted Bonnet Rising Stem Flanged End Flexible Wedge Gate Valve, JIS B2401 As568 BS1516 Viton EPDM NBR HNBR FPM Corrosion Resistant Wearable Rubber Ring O Ring for Auto Parts, Forged …

Back seat rising stem gate valve ERC Industries Inc.

Apr 23, 1998 A back seat rising stem gate valve has a valve body with a flow passageway through it and an open top, a gate that is vertically positioned to open and close the passageway, a stem extending upwardly from the valve body, the lower end of the stem being attached to the gate, a bonnet secured to the valve body by which the valve body open top is closed, the stem extending through an opening in …

What is the Valve Backseat Test

The backseat feature is a feature that allows valve packing being replaced while it is in the service. The valve shall be mounted in test bench with fully opened position and valve ends closed. The packing gland shall be loose or packing not installed. The valve body shall be subjected to hydrostatic pressure, and no leak is permissible from packing and packing gland.

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