Outside Screw and Yoke (OS&Y) Gate Valve - Grooved


Technical Features

  • Sizes available (Nominal) : 2”/DN50, 2-1/2”/DN65, 3”/DN80, 4”/DN100, 5”/DN125, 6”/DN150, 8”/DN200, 10”/DN250 and 12”/DN300
  • Working pressure :21 bar (300 psi)
  • Seat Type: Resilent wedge
  • Finish :Fusion bonded expoxy coating internal and external
  • Connections : Grooved metric or AWWA C606 standard
  • Specification : Design and dimensions conform to AWWA C515
  • Features : Pre-notched, stainless steel stem for easy attachment of supervisory switch
  • Note : Size 5” is only UL listed

Outside Screw and Yoke (OS&Y) Gate Valve - Grooved - OSG

Physical Data

Outside Screw and Yoke (OS&Y) Gate Valve - Grooved - OSG

Materials List


  • Piping systems and valves should be thoroughly cleaned and free from ingress of foreign materials.
  • Visually inspect the valve seating and ports for cleanliness immediately prior to installation.
  • All valves should be independently supported against movement and stress from the connected piping system.
  • Ensure that the valve pressure rating is compatible with service conditions.
  • Operate the valve at least once from the open to closed position.
  • Verify that packing nuts are tight before pressurizing the system.
  • Gate valves are not suitable for throttling applications.
  • Gate valves should be installed in the vertical position on horizontal pipework and in the horizontal position on vertical pipework.

Inspection and Maintenance

  • Valves should be inspected periodically and should be cycled to prevent buildup of foreign materials in the piping system and valve body.
  • In the event of a packing leak adjust the packing nuts to increase pressure on the stem packing. Packing nuts should be tightening evenly approximately a quarter turn in a clockwise direction.
  • Always shut down the system before repacking the valve. Valves are designed with backseats for repacking under pressure but this is not recommended.


Gate valves are manually operated multi-turn valves and are opened by a handwheel or other operating device, generally in a counter clockwise direction and then closed clockwise.