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API Valves

Weir API valves feature a bi-directional slab gate, metal-to-metal sealing technology and stem backseating capability ideally suited for drilling manifolds, Christmas trees and severe service.

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Weir offers a full range of valves for drilling and production operations. Gate valves are designed and manufactured in accordance with API 6A latest edition PSL 1-4 while the robust, simple and reliable gate and seat design promotes ease of service with in-line maintenance.

Features include positive metal-to-metal sealing (gate-to-seat and seat-to-body), and stem packing that is chemically inert using spring energising rings which require no adjustment or plastic injection.

Stem packing can be replaced while the valve is under pressure and comes in API material classes AA through HH. Material for hydrogen sulfide and carbon dioxide service lies in accordance with NACE MR-01-175 latest edition. All valves are performance tested to PR2, with temperature ratings K through X up to 177°C (350°F).

Key features/benefits

  • Pressures up to 15,000 PSI for various API valve sizes
  • Metal-to-metal seals: Seals are stable, thermally insensitive and environmentally resistant; Utilised in the gate/seat, body/bonnet and stem/bonnet backseat
  • Selective backseat: Provides unparalleled safety during venting, lubrication and stem packing replacement; Allows stem packing replacement without removing valve from service
  • Slab gate: Assures smooth operation during extreme thermal cycles
  • Floating seats: Allows bi-directional use
  • Threaded packing gland: Transfers stem packing loads to the bonnet, protecting the bearing assemblies
  • No body penetration
  • Non-rising stem
  • Stem shear pin
  • In-line repairability


  • Production

Weir WCS-10 API Valve Spec Sheet


Design standards 

PI 6A latest edition PSL 1-4

Design ratings 


Size range/-dimensions


Pressure class/-power

Pressures up to 15,000 PSI

Temperature range

K through X up to 177°C (350°F)



Product Support and Services

We design and manufacture products and services that meet and exceed the challenges faced by the global energy industry. As a trusted partner, we support customers through the total life of their assets and aim to extend the life of equipment through our comprehensive engineered aftermarket services.

Call upon Weir for knowledgeable, reliable inspection, repairs, certification, rebuild and asset management services and supporting spare parts. We also offer alternate solutions to capital expenditures through our robust rental service programmes.

Through a global network of service centres, mobile inspection units and customer embed programme, Weir offers highly qualified personnel who provide services when and where you need them.

For any of these services, please use our global map to locate your nearest Weir contact or simply click on the request information tab above and fill in an enquiry form and we will be happy to help.

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Personal Details

Due to recent changes in data privacy laws in Russia, we are unable, at this time, to accept enquiry form submissions from businesses based in Russia. Please email your enquiry to the global contact address shown on this page and we will respond to your enquiry directly.

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Key Information

Product type

API Valves

Industries served

Oil & Gas