The connection between the bonnet and the body may be threaded, flanged, welded, or pressure sealed, or the bonnet and the body may be integrated without connection. The forging body flange and Bonnet flange are joined by studs and nuts, with a gasket of suitable design/material inserted between the flange faces to facilitate sealing. OS&Y (Out screw & yoke) bolted bonnet Gate valves are used to control the flow of fluids like water, steam, gas or acid.

PERFECT is a fully stocked manufacturer and supplier of gate valve and we provide a broad range of standard commodity forged Outside Screw & Yoke gate valve for sale that is supplied to various industries. Available in size ranges from 2 inches to 24 inches and ASME B16.34 pressure classes from #600 to #2500, We can also accept the OEM design, so whether you need special valves or have a large order to place, we can provide you with the customized service for you. Please review the charts below for available sizes & pressure & material or fill the contact form below.

  • Forging steel body offers superior strength and optional cast steel;
  • Outside Screw & Yoke (OS&Y)Rising Stem offers tight seal with little to no maintenance over long periods of time;
  • Stronger, leakproof bolted body bonnet joint ensures joint tightness with a higher bolting torque;
  • Body guided disc eliminates side thrust and provides longer disc, seat and body life.

OS&Y bolted bonnet gate valves design

Application   Flow connecting or cutting off
Design Standard
  • API 602, ISO 15761, ASME B16.34
F to F Standard ASME B16.10
Testing Standard API 598
End Connection Standard ASME B16.5
Size NPS 2 1/2 – 14 (DN 65 – 350)
Pressure Class Range
  • ASME Class 150 – 1500
Ends Flanged ends, Threaded ends, Socket welded ends
  • Body: A105 , alloy F22, F11,F304, F316
  • Disc: 13% Cr, 18%Cr8%Ni, Stellite, Monel Alloy20, Bronze, etc
  • Seat: EPDM, Nitrile, PEEK, PTFE, etc

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