Cast Steel Valve,
Design and manufacture:BS1873 and ASME B16.34
Face to face end:ASME B16.10
Pressure-temperature ratings：ASME B16.34
Flange end dimension:ANSI B16.5
Usually use hand wheel,impact hand wheel,worm gear box.
Chain wheel and electric actuator can also be used if required by customer.
Body and Bonnet Construction
The body and bonnet of CLASS 150-900 are usually connected by stud and nuts.CLASS 1500- 2500 usually use pressure seal design.
Structure of Globe Valve
Bolted bonnet;Outside Screw and Yoke;Metallic seating surface
Gasket of cover flange:
For 150LB,we use stainless steel add flexible graphite combined gasket.
For 300LB,we use stainless steel add flexible graphite wounded gasket
For 600LB,we use stainless steel add flexible graphite wounded gasket, metal ring joint gasket on optional
For 900LB and above, we use metal ring joint gasket.
Usually we use flexible graphite, also PTFE or other combined packing material can be used according to buyers.
The internal surface of the stuffing box, of which area is contracted with the packing, is of excellent finish(3.2 aarh),can ensure the stem and packing combine close but rolled well.
Back seat design
All our gate valves have back seat design. Normally, the carbon steel gate valve is fixed with a renewable backseat, for
stainless steel gate valve, the backseat is machined directly in the bonnet or machined after welding.
When the gate valve is at full open position,the sealing of the backseat can be reliable.However,
as per API600,it’s not advisable to change packing when the valve is under pressure.
The stem is of integral forged design. The connection of stem and disc is T type.
The strength of connecting area is stronger than the T threaded part of stem. And test as per API 591.
Stem nut design.
Usually ,the stem nut is made of ASTM A439 D2, also can be changed into bronze as per
buyer’s request. For large size gate valve, rolling bearing is fixed between nut and stem,
which can reduce torque and make gate valve easy to open.
Besides general globe valve,we also provide cryogenic globe valve,jacketed globe valve etc.