Gasket of Cover Flange
Stainless steel + flexible graphite wounded gasket is used for Class 150 and Class 300 globe valve. Stainless steel + flexible graphite wounded gasket is used for Class, and ring joint gasket is also optional for Class 600.Ring joint gasket is used for Class 900 globe valve. Pressurized seal design is used for Class 1500~Class 2500 globe valve.
Packing seal
Molded flexible graphite is used for packing material. PTFE or combined packing material can be also used if being requested by the customer. The internal surface of the stuffing box, of which area is contacted with the packing, is of excellent finish(Ra 3.2um).The stem surface ,contacting with the packing, should be rolled and pressed after being precisely machined, so as to reach to the high finish and compactness(Ra 0.8um)and ensure the reliable tightness of the stem area.
Belleville spring loaded packing impacting system
If being requested by the customer, the Belleville spring loaded packing impacting can be adopted for enhancing the durability and reliability of the packing seal.
Back seating design
All our globe valves have the back seating 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, it is not advisable to add or change packing by the mean of back seating when the valve is pressure containing.
Seat
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 for NPS<8 globe valve, and welded on seat can be also optional if being requested by the customer. Welded on seat is used for NPS>10 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 being requested by the customer.
Stem design
The stem is of integral forged design. The minimum diameter of the stem shall per the standard requirement.
Stem nut
Usually, the stem nut is made of ASTM A439 D2.It is also can be made of copper alloy if being requested by the customer. For large sized 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.
Special globe valve
Besides the common globe valves, We also makes cryogenic globe valve(Extended bonnet), bellow sealed globe valve, Jacketed globe valve, with bypass globe valve.By-Pass and Drain Connections，Indicator and Locking Devices ,etc.
Operation type
Handwheel,Gear, Electric actuator,Pneumatic actuator,Bare stem.
Standard
Design and Manufacture: BS1873 or ASME B16.34
Inspection and Test: API 598
End flange dimension: ASME B16.5,ASME B16.47(API 605 ,MSS SP44)
Butt weld end dimension: ASME B16.25(BW)
Face to face,end to end: ASME B16.10
Pressure-temperature ratings: ASME B16.34
NACE: NACE 0175
Material
ASTM A216 WCB WCC;ASTM A217 WC1 WC6 WC9;ASTM A351 CF8,A351 CF8M,
A351 CF3,A351 CF3M,A351 CN7M;.ASTM A352 LC1 LCB LCC LC3 or by customers
austenite; duplex stainless steel; ferrite; stainless steel;steel castings
(Cast Steel, Alloy Steel, Stainless Steel, Special Steel)
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