♦ Gate Valve was developed to satisfy the needfor a high quality reliable valve which is reasonably priced. AllGate valve makes full use of modern materials andmanufacturing techniques. It is easy to maintain, conforms

tointernational design requirements and Quality AssuranceProgramme. All HONGTAl Gate Valve are manufactured toAPI 6A Specification as a basic minimum, in a Plant that isAPI Q1 and ISO9001 approved and Certified.

♦ Forged or Cast Body & Bonnet

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

♦ Metal-to-Metal Seat to Body Interface

Precision lapped faces between the gate and seat ensure ametal-to-metal pressure tight seal is maintained. Seat islapped on both surface to give a true metal to metal sealbetween the body and seat. This seal is further

reinforced andprotected by a Teflon or Viton lip seal, giving bubble tightsealing 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 solidslab gate gives a true downstream seal resulting inexceptionally low operating forces.

♦ Gate & Seat Design for Expanding Gate

The expanding gate creates a positive mechanical seal across theseats with or without line pressure. Floating seals withr esilient sealsallow the seats to be tightly wedged into the seats pockets in the open orclosed

position.

♦ Bi-directional Sealing

All HONGTAI Gate Valve is a true bi-directional valve. Being fullysymmetrical,it will effectively seal pressure from either direction withoutthe 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 stainlesssteel skirts. The skirts minimize the ingress of well fluid mud and sandinto the body cavity.

♦ Body to Bonnet Seal

A metal-to-metal seal is achieved between the body and bonnet usingHONG TAl metal-to-metal sealing technology. The sealringis re-useable.

♦ Non-rising Stem with Backseat

All stem seals are non-elastomeric and are inert to most known liquidsand gases.Being made from PTFE/R-PTFE stem frictional resistance isminimized resulting in lower operating torque. The stem seal design issuitable

for all temperature range and services. Graphite stem packingis option on user request.

♦ Bearing

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