600lb Class 900 gate valve

描述

API Gate Valve – Class 600 & Class 900 gate valve
API Class 600 & Class 900 gate valve

Design of disc
Gate valves with NPS≥2 are of wedge flexible gate;
Gate valves with NPS< are of wedge solid gate

Body and bonnet connection
The body and bonnet of Class 150~Class 900 gate valves are usually connected with studs and nuts;
And the body and bonnet of Class 1500~Class 2500 gate valves are usually of pressurized seal design.

Gasket of Cover Flange
Carbon steel or stainless steel +flexible graphite combined gasket is used 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 gate valves, 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 Class 1500~Class 2500 gale valve.

Actuation
Hand wheel or gear box is usually used for gate valve actuation. Chain wheel and electric actuator can be also used for gate valve actuation if being requested by the customers.

Seat
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 the customer. Welded an seat is used for NPS 1/2~2, Renewable, threaded seat is used for NPS≤8 gate valves, and welded on seat can be also optional if being requested by the customer,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 customer have any other request about the seat please kindly advise befor placing the order.

Back seating design
 All of 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.