Product description：
Microfiber braided string
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The features of globe valve
The valve features a bolted bonnet design with an outside screw and yoke configuration. Its rising stems allow for easy operation and the metallic seating surfaces ensure durability and reliability.
Body and Bonnet Connection
Globe valves of Class150 to Class900 typically have a bolted bonnet design, whereas the ANSI Globe Valve of Class1500 to Class2500 are commonly manufactured with a pressurized seal design. By rearranging the original content, it can be stated that the body and bonnet of globe valves in the Class150 to Class900 range are typically designed with bolts, while the Class1500 to Class2500 ANSI Globe Valve usually incorporates a pressurized seal design.
Gasket of Cover Flange
The use of stainless steel + flexible graphite wounded gasket is common in globe valves of Class 150 and Class 300. In addition to this, for Class 600 globe valves, there is an option to include a ring joint gasket. Conversely, for Class 900 globe valves, the ring joint gasket is the preferred choice. Moving on to higher pressure classes, pressurized seal design becomes imperative for globe valves ranging from Class 1500 to Class 2500. This ensures the optimal functioning of the valves in high-pressure environments.
Actuation
The common methods for actuating a globe valve include using a hand wheel, impact hand wheel, or gear box. If a customer requests it, a chain wheel or electric actuator can also be used. It is important to select the appropriate actuation method based on the specific requirements of the application.
Packing seal
Packing material for the stuffing box often includes molded flexible graphite. However, if the customer requests it, we can also provide PTFE or combined packing material. It is important to note that the internal surface of the stuffing box, where it comes into contact with the packing, has a remarkable finish with a roughness average (Ra) of 3.2um. To ensure a reliable seal in the stem area, the surface of the stem that contacts with the packing should be precisely machined, rolled, and pressed. This process enhances the finish and compactness of the stem surface, reaching a smoother Ra value of 0.8um. Overall, these measures guarantee the secure tightness of the stem area, providing optimal performance.
Belleville spring loaded packing impacting system
To enhance the durability and reliability of the packing seal, the adoption of the Belleville spring loaded packing impacting can be considered when requested by the customer. It is recommended to utilize this method as it proves effective in ensuring the longevity and trustworthiness of the packing seal.
Back seating design
It's worth noting that all of our globe valves have a back seating design. As for carbon steel valves, they come equipped with a renewable back seat, while our stainless steel valves have a back seat that is either machined directly into the bonnet or machined after welding. When fully open, the back seat provides a reliable seal, ensuring optimal valve performance.
However, it's important to remember that, according to API regulations, attempts to add or change packing by means of back seating while the valve is still containing pressure is inadvisable. We take this advice seriously and encourage our customers to follow proper safety protocols when operating and maintaining their valves to ensure optimal performance and longevity.
Seat
The seat of a carbon steel globe valve is typically made of forged steel. To ensure a proper seal, the sealing surface of the seat is spray welded with a hard alloy as specified by the customer. For globe valves with an NPS (Nominal Pipe Size) smaller than 10, a renewable threaded seat is used. However, if the customer requests it, a welded-on seat can also be provided. On the other hand, carbon steel globe valves with an NPS larger than 12 use a welded-on seat. When it comes to stainless steel globe valves, an integral seat is usually adopted, or in some cases, hard alloy is directly welded onto the seat. If the customer desires, threaded or welded-on seats can also be provided for stainless steel globe valves.
Stem design
The stem has been designed using integral forging, with the minimum permissible diameter according to industry standards. To comply with regulations, the stem's diameter cannot be reduced beyond the prescribed minimum limit. Let's ensure that the stem meets all the necessary requirements to operate optimally.
Stem nut
The stem nut is typically constructed from ASTM A439 D2 material, although customer requests may specify the use of a copper alloy. In the case of larger globe valves, rolling bearings are incorporated on both sides of the stem nut to reduce the torque required for valve operation. This effectively minimizes the effort involved in opening and closing the globe valve.
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