Alloy Steel Wellhead Platform Equipment , Gate Wellhead Valves API 6A Standard

Wellhead Equipment Component, Gate Valve API 6A Standard, Sour Service

Tiptop gate valves are available in temperature classes L, P, R, S, T, U type specified in API Spec 6A. Gate valve to be used in 350°C or 650°C for high temperature service can be supplied on request. Fireproof gate valves also can be supplied to API 6A. Our gate valves are available in 2000psi, 3000psi, 5000psi, 10000psi and 15000psi working pressure, material classes from AA through FF, product specification levels (PSL) from 1 through 3 and performance requirement (PR) 1~2.

Forged or Cast Body & Bonnet

All type gate valve bodies and bonnets are manufactured from forged or cast AISI 4130/4140 low alloy or AISI 410 SS steel. Other materials for extreme service, such as Inconel or Duplex stainless steel are available to order.

Metal-to Metal Seat to Body Interface

Precision lapped faces between the gate and seat ensure a metal-to-metal pressure tight seal is maintained. Seat is lapped on both surface to give a true metal to metal seal between the body and seat. This seal is further reinforced and protected by a Teflon or Viton lip seal, giving bubble tight sealing performance at pressure below 10 psi.

Gate & Seat Design for Slab Gate

The seat in the gate valve are fully floating, this combined with a solid slab gate gives a true downstream seal resulting in exceptionally low operating forces.

Gate & Seat Design for Expanding Gate

The expanding gate creates a positive mechanical seal across the seats with or without line pressure. Floating seals with resilient seals allow the seats to be tightly wedged into the seats pockets in the open or closed position.

Bi-directional Sealing

All our Gate Valve is a true bi-directional valve. Being fully symmetrical, it will effectively seal pressure from either direction without the risk of pressure lock. If the valve is used in uni-directional application, the gate and seats can be reversed to give a extra service life.

Gate Guided

The gate is guided positively by the valve body and close fitting stainless steel skirts. The skirts minimize the ingress of well fluid mud and sand into the body cavity.

Body to Bonnet Seal

A metal-to-metal seal is achieved between the body and bonnet using metal-to-metal sealing technology. The seal ring is re-useable.

Non-rising Stem with Backseat

The stem used in the gate valve is manufactured from Alloy-Nitrided or 17-4 stainless steel. Being of the non-rising design, valve operation will not increase the pressure in the body cavity. Seal against the bonnet, providing means to replace the valve stem packing with the valve is under pressure.

Stem Seal

All stem seals are non-elastomeric and are inert to most known liquids and gases. Being made from PTFE/R-PTFE stem frictional resistance is minimized resulting in lower operating torque. The stem seal design is suitable for all temperature range and services. Graphite stem packing is option on user request.

Bearing

Heavy duty thrust bearing are used to absorb stem thrust and reduce operating torque. A grease fitting is located on the bearing cap to allow for lubrication to ensure continued trouble-free operation.

Specification

Other trims are also available upon request.