Frequent on-off service Processes where “instantly" large flow is needed
Flexible wedge for improved seating ease of operation, specially in high temprature service, wedges are accurately guided thru the entire stroke
The body&bonnet between cass 150 to 600 bolted bonnet for 900 and above pressure seal design.
Stainless steel + flecible graphite spiral wounded gasket is used for 150 to 600 class, ring joint gasket is also optional for class 600 valves, for class 900 and above pressurized seal design is used.
Die moulded pure graphite rings with top and bottom ring of brained graphite with inconel wire reinforcement
Usaully made of ASTM A439 D2, for large size of valves rolling bearing is fitted at the two sides of the stem nut un order to minimize the open and close torque of valve.
Handwheel or Gear box is usually used for gate valve actuation.
Chain wheel, pneumatic cylinder and electrical actuator can be also used for the valve actuation if being requested by customer.
All our gate valve have back seat design, carbon steel valves is fitted with removeable back seat for stainless steel integral machined with bonnet.
Seat faces lapped for smooth finish and superior sealing. Optional renewable threaded seat or welded seats are as per customer specification.
Stems are non-rotating with surface finish to maximize packing seal for low fugitive emissions.