Wagi Gate Valve
Design of Disc
Gate valves with NPS > 2 are of wedge flexsible gate; Gate valves with NPS < 2 are of wedge solid gate.
Body and Bonnet Connection
The body and bonnet of class150 gate valves are usually connected with studs and nuts; and the body and bonnet of class 1500 – 2500 gate valves are usually of pressurized seal design.
Gasket of Cover Flange
Carbon Steel or Stainless steel + Flexible graphite combined gasket is used for class 150 gate valve; stainless steel + flexible graphite wounded gasket is used for class 300 gate valve; stainless steel + flexible graphite wounded gasket is used for class 600, and ring joint gasket is also optional for class 600
gate valve; ring joint gasket is used for class 900 gate valve; pressurized seal design is used for class1500 – 2500 gate valve.
Hand wheel or Gearbox is usually for gate valve actuation. Chain wheel and electric actuator can be also used for gate valve actuation if being requested by the customers.
For Carbon steel gate valve, the seat is usually forged steel. The sealing surface of the seat is spray welded with hard alloy specified by customer. Welded an seat is used for NPS 1/2-2, renewable, threaded seat is used for NPS < 8 gate valve, and welded on seat can be also optional is being requested by the customer. Welded on seat is used for NPS > 8 carbon steel gate valves. For stainless steel gate valve integral seat is usually adopted, or to weld hard alloy directly integrally, threaded or welded on seat is also optional for stainless steel gate valve if being requested by the customer. If the customer have any other request about the seat, please kindly advise before placing the order.
Back seating design
All our gate valves have the back seating design. In most cases, the carbon steel gate valve is fitted with a renewable back seat. For stainless steel gate valve, the back seat is machined directly in the bonnet or is machined after welding.