Project DescriptionAPI Flanged Globe Valve
Hand wheel or gearbox are usually applied, if required, chain wheel, impact wheel is also available. Top flange dimension as per ISO 5211, electric, pneumatic is also available if required.
All SGV globe valves have the back seat design. In most cases, the carbon steel globe valve is fitted with a renewable back seat. For stainless steel globe valve, the back seat is machined directly in the bonnet or is machined after welding. When the globe valve is at fully open position, the sealing of the back seat can be very reliable. However, as per the requirement of API, the packing shall not be added or changed by the mean of back seating when the valve is Pressure containing.
For carbon steel globe valve, the seat is usually forged steel. The sealing surface of the seat is spray welded with hard alloy specified by the customer. Renewable threaded seat is used forNPS≤10 globe valve, and welded on seat can be also optional if required. Welded on seat is used for NPS ≥ 12 carbon steel globe valves. For stainless steel globe valve, integral seat is usually adopted, or to weld hard alloy directly integrally. Threaded or welded on seat is also optional for stainless steel globe valve if required.
Stem (Please refer to Flexible Wedge Gate Valve)
Generally, the stem nut is copper alloy material. It is also can be made of ASTM A439 D2 if required. For large size cast globe valve, rolling bearing is fitted at the two sides of stem nut in order to minimize the open and close torque of the globe valve.
Gasket of Cover Flange
Usually Carbon steel or stainless steel + flexible graphite wouded gasket is used for Class150 and Class300 Stainless steel + flexible graphite wounded gasket is used for Class600, and ring joint gasket is also optional for Class600. Ring joint gasket is used for Class900 globe valve. Pressurized seal design is used for Class 1500～Class2500 globe valve.
Body and Bonnet Connection, studs and nuts or pressure seal
The body and bonnet of Class150～Class900 cast globe valves are usually connected with studs and nuts. And the body and bonnet of Class1500～Class2500 cast glove valves are usually of pressure seal design. But if required, pressure seal can be also available for class600 or class900.
Special Globe Valve
Besides the common cast globe valves, gangye also offer Extension Stem Globe Valve, cryogenic globe valve,bellow sealed globe valve,Jacketed globe valve for kinds of application.