1.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.
2.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.
3.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.
4.Bi-directional Sealing
All Douson 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.