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            Welcome to Zigong Weite Valve Mfg Co.,Ltd!

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            Gate Valve

            Gate Valve

            • Gate Valve Manufacturing Specification   ContentAPI series   Basic design specificationAPI 600   Pressure-temperature ratingASME B16-34   Structure lengthASME B16-10   Flange type and sizeASME B16-5   Butt weld end ...
            Products Content

            Gate Valve Manufacturing Specification

              ContentAPI series
              Basic design specificationAPI 600
              Pressure-temperature ratingASME B16-34
              Structure lengthASME B16-10
              Flange type and sizeASME B16-5
              Butt weld end ASME B16-25
            Inspection and testAPI 598
            Structural style

            Gate valve adopts OSY and BB(bolted bonnet), Rotate-Rising stem and non-rise hand wheel which is international current gate valve structure.


            Body and Bonnet

            Body and bonnet design is according to precise calculation in order to realize good strength, rigidity and flow capacity. There designs a upper seal support on bonnet that makes packing seal more reliable in the valve full open condition, also replace packing conveniently.


            Disc
            Adopting H-type elastic single disc to suit the valve body deformation and keep sealing reliable, which avoids valve hard to be opened due to disc overloads. So it is suitable for steam and other high temperature medium.
            Seat
            For different pressure and specification, there are several seat forms below:
            1.Seat ring connects or welds female end body by thread for easy disassembly, maintenance and replacement.
            2.Directly bead welding sealing surface material on body.
            3.For SS valve ,popularly seat sealing surface will be processed molding directly on body.
            Stem and stem nut
            Stem connects disc by T-slot, the whole forging forming T-shape stem assures enough connection strength. Stem is operated by hand wheel drives stem nut, the transmission between stem and stem nut uses suitable fit clearance and unique dentoform correction to ensure flexible valve drive. Top assembling stem nut keeps stem and disc never drop down even if discharging the hand wheel when valve is open.For the large diameter gate valve , the thrust bearing is designed in the place of stem nut.
            Packing and packing spacer ring
            The size and quantity of packing meet the standards and ensure reliable sealing. Packing is graphite( free from asbestos). Packing spacer ring can be provided when customers require.(no packing spacer ring in standard product).
            Body Gasket
            The flange connection form of body and bonnet is bolt fastening. Flange sealing gasket forms below:
            CLASS150   & PN1.6, 2.5Mpa flat gasket sealing.
            CLASS300   & PN4.0, 6.4Mpa concave-convex gasket sealing.
            CLASS600   & PN10.0Mpa and above octagon gasket sealing.
            The gasket is inner ring spiral wound gaskets filled graphite which abandoning rubber asbestos plate used before for making good gasket sealing and good disassembling resilience performance.

            According to various usage and base on the body material, the VT gate valve is divided into WCB series,SS (CF8,CF3,CF8M,CF3M) series, LCB and LCC series, Cr-Mo series. Main components material list below:

            PartsCS classAntiacidSS   classCryogenic steelHigh-temperature   steel
            WCBWCBCF8,CF3CF8M,CF3MLCB,LCCWC5,WC9,C5
            Body & BonnetA216-WCBA216-WCBA351-CF8.CF3A351-CF8M.CF3MA352-LCB,LCCA217-WC5WC9.C5
            DiscA216-WCBA216-WCBA351-CF8.CF3A351-CF8M.CF3MA352-LCB,LCCA217-WC5WC9.C5
            Brake seatA105A105A105A182-F316,F316LA182-F304A182-F304
            Stem & upper sealA182-F6a318(MFG.N.O)A182-F304,F304LA182-F316,F316LA182-F304A182-F304
            Stem nutA439-D2/ZQAI9-4
            StudA193-B7A193-B7A193-B8A193-B8MA320-L7A193-B16
            NutA194-2HA194-2HA194-8A194-8MA194-7A194-4
            PackingGraphite
            GasketSpiral wound gasket/mild steel
            Hand wheelDuctile iron/cast steel
            NOTES:
            All casting material complies with ASTM standard, all forging material are choosen chinese grades on equal grounds with ASTM standard.
            The material above is general product standards, we can change material according to working condition or customers' requirements and also we reserve the right of complying with standard specification for improving material.


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