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        1. Welcome to SICHUAN SAIER VALVE MFG. CO., LTD.
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          CONTACT US
          Tel:+86-813-5502212
          Fax:+86-813-5502209
          E-mail:sevvalve@163.com
              sev-grace@163.com
              sevmaggie@sina.com
          Skype:sev-grace 
             maggie1123
          Gate valve
          2014.12.11 / VIEW:2205

          Gate Valve Manufacturing Specifications

           Content  Specification
           General design standard  API600
           Pressure-temperature rating  ASME B16.34
           Face to face dimensions  ASME B16.10
           Flange type and dimensions  ASME B16.5
           Butt-welded end  ASME B16.25
           Inspection and test  API598
          SEV Gate Valve Construction Features Function
          ● Construction
          SEV gate valve adopt OS&Y. B.B. Rising Stem, Non-rising handwheel, which is in
          accordance with international general standard.
          ● Body and Bonnet

          After being strictly calculated, the design of the body and bonnet possess good

          performance of strength, rigidity, perfect seal and flowing ability. It makes more
          reliable for the seal of the packing and more convenient for the replacement of the
          packing to have assembled backseat onto the bonnet.
          ● Wedge

          SEV gate valve adopt H type flexible solid wedge, which have excellent fitness to the

          body deform and so can guarantee reliability of the valves seal. This design can
          also reduce the overload caused by the difference in temperature load of the stem
          and the sealing surface. Particularly, it can avoid hard-to-open jam caused by the
          over load of the wedge. So this design is more fit to steam and other high
          temperature devices.

          ● Seat

          For SEV gate valve in different pressure or specifications, the seat would have the
          following types:
          1.The connection of the seat ring and the body may either be threaded or welded
          type. The threaded type seat is easy for disassemble, maintenance and replacement.
          2.The sealing surface is directly welded on the body.
          3.For stainless steel gate valve, the sealing surface is machined and finished on
          the body.

          ● Stem and Yoke Sleeve

          T type is used for the connection between the stem and the wedge disc. The
          strength of the connection is guaranteed by integral forging of the T head and stem.
          The thread coordination of the stem and yoke sleeve adopts appropriate fit
          clearance and special thread remedy to ensure flexibility of the valve’s actuation.
          While opening the valve, the top assembled yoke sleeve can ensure that the
          opening position of the disc will not change at all, even though the handwheel is
          disassembled. For high pressure and large size gate valve, there is a bearing is
          designed at the yoke sleeve.
          ● Packing and Lantern Ring
          The dimension and quantity of the packing conform to the standard to ensure the
          reliability of sealing. Packing materials are made of graphite (free of asbestos). The
          lantern ring may be supplied if the customers require.
          ● Gasket
          Connection between body and bonnet adopt bolted flange. The gasket of flange
          shall be as follows: CLASS 150 Flat Gasket CLASS 300 Female or Male Gasket
          CLASS 600 & larger Octagon Ring Gasket The metal spiral wound gasket with inner
          ring and filling with graphite makes more reliable for the seal of the gasket and
          excellent capability of disassembling and reassembling.

           

           

           

           

          According to the different usage, on the basis of the valve body material, SEV globe valve shall include: Carbon Steel
          Series, Stainless Steel Series, Low Temperature Steel Series, High Temperature Steel Series, Sulfur-proof Series.
          Notes:
          1. All materials conform to ASTM specifications.
          2. Sealing surface material code is SEV code, please refer to figure number.
          3. Materials above is general valve design standard. The valve may be obeyed to SEV reconfirmation when the customers

           

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