gate valve ； CLASS150--2500 gate valve ;
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 1000 pc
- Supply Capability:
- 30000 pc/month
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Specification
Standards
Design and Manufacture: Cast steel gate valve to API 600(ISO10434)or API 6D(IS014313) Cast stainless steel gate valve to API 603 or API 600(IS010434) Forged steel gate valve to API 602.
Inspec tion and Test: API 598, API 600 or API 6D
End flange dimension: ASME B16.5(for NPS<24): ASME BI6.47 series B API 605 or ASME B16. 47 series A. MSS SP-44 (for NPS> 24)
BW end dimension. ASME B16.25
Socket-weld dimension. ASME B16.11
Face to face and end to end. ASME BI6. 10
Pressure-temperature ratings: ASME B16. 34.
Design of Disc
Gate Valves with NPS=2 are of flexible wedge gate; Gate valves with NPS 2 are of solid wedge gate
Body and Bonnet Connection
The body and bonnet of Class 150-Class 900 gate valves are usually bolted bonnet design. And 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 for Class 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 valve, 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 for Class 1500 --class 2500 gate 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
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 intenal surface of the stuffing box, of which area is contacted with the packing, is of excellent finish (Ra 3.2 m). 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 0.8 m )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 system can be adopted for enhancing the durability and reliability of the packing seal
Back Seating Design
All 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. When the gate valve is at fully open position, the sealing of the back seat can be very reliable. However, as per the requirement of AP 600, 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 gate 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 10 gate valves, and welded on seat can be also optional if being requested by the customer. Welled on seat is used for NPS 10 carbon steel gate valves. For Stainless steel gate valve, integral seat is usually adopted, 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
Stem Design
The stem s of integral forged design. The minimum diameter of the stem shall per the standard requirement.
The connection of the stem and disc is T type. The strength of the connecting area is bigger than that of the T threaded part of the stem. The strength test of that area conforms to API 591
Stem Nut
Usually, the stem nut is made of ASTM A439 D2. it is also can be made of copper ally if being requested by the customer. For large sized gate valves( NPS 10 for Class 150, NPS 8 for Class 300, NPS 6 for Class 600, NPS 5 for Class 900), rolling bearing is fitted at the two sides of the stem nut in order to minimize the open and close torque of the gate valve
Special Gate Valve
Besides the common gate valves, my Company also makes cryogenic gate valve, Jacketed Gate Valve, Bellow Sealed Gate Valve, Extension Stem Gate Valve for underground application, Flat Gate Valve, etc.
- Q: What are the working principles of the electric gate valve?
- Ordinary type electric valve should be equipped with the control box, the motor is the true story and the inversion, and in general to a trip signal signal is normally open and normally closed, closed in place are normally open and normally closed two points according to their own needs wiring, three lines and then open and close control of the line of control there are also 4 lines to control some manufacturers, as well as the valve position, some three lines connected with the potentiometer, some installed valve position transmitter is connected with two lines, and over torque protection fault signal.
- Q: The difference between cut-off valve and gate valve
- The working principle is different. The stop valve is an upward stem type, and the handwheel rotates and rises with the stem. Valve is hand wheel rotation, stem upward movement. Flow is not the same, the gate valve requires full open, the cut-off valve is not the same. The gate valve has no inlet and outlet direction requirements, and the cut-off valve has the required inlet and outlet!Gate valve and stop valve are shut-off valve, is the most common two valves.From the exterior, the gate valve is shorter than the cut-off valve, especially the bar valve needs a higher height space. Valve sealing surface has a certain degree of self sealing capacity, its spool depends on the media pressure tight contact with the valve seat sealing surface, to achieve tight leakage. Wedge gate valve spool angle is generally 3~6 degrees, when forced to shut down excessive or temperature changes of the valve core is easy to die. Therefore, high temperature and high pressure wedge gate valve, in the structure have taken certain measures to prevent spool stuck. The valve in the opening and closing valve and valve seat sealing surface contact and mutual friction is always so easy to wear sealing surface, especially in close off the valve, the valve before and after the great pressure, sealing surface wear is more serious.
- Q: Is the gate valve clockwise or closed?
- In general, the valve is clockwise to turn off. Some of the clockwise rotation of the valve on the move is open
- Q: What do you mean by forged steel gate valves 800LB DN20 SW?
- Forged steel gate 800LB pressure DN20 is by SW said socketweld (connection)
- Q: What are the common standards for gate valves?
- Is the gate valve opening and closing parts, RAM direction of motion perpendicular to the direction of the fluid, valve can only be fully open and fully closed, can not be adjusted and the throttle. The following common standards for Fujian Biaoguang valve for valve: design specification: JB/T 7746, API602 JB/T 7746, the length of the structure specification / thread socket factory test and inspection of JB/T1751/GB7306, ANSI: B16.11/B2.1: JB/T 9092, API598 pressure temperature: GB/T 9131, ANSI B16.34, MSS GB/T 12220 product ID: SP25 delivery specification: JB/T 7928
- Q: What kind of copper gate valve copper content standards, there are no national standards?
- Please refer to: GB/T12225-2005 "general purpose valve, copper alloy casting technical specification" and GB/T 15116-1994 "die casting copper alloy"
- Q: Will the water supply and drainage to wear civil air defense gate valve, the use of bright rod or dark rod?
- Water supply and drainage and civil air defense works, now with the dark rod type elastic sealing gate valve more.Compared to the gate and the traditional carve type or parallel double gate plate valve has the following characteristics: 1, soft sealing valve body, valve cover using precision casting foundry, a molding, no mechanical processing, do not use sealed copper ring, saving non-ferrous metals;
- Q: What are the structural differences between parallel and wedge valves?
- The advantages of dual gate plate is sealed and angle precision low temperature is not easy to make the wedge gate, the abrasion of the sealing surface and shim.The disadvantage is that the structure is complex, easy to stick in the dry medium, mainly the upper and lower baffles. After years of corrosion, the gate is easy to fall off. Although the single gate is sealed and angle accuracy requirements are relatively high, difficult processing and temperature change may make the gate wedge and other shortcomings, but has the advantages of simple structure, reliable use, especially to the flexible gate, can produce the micro elastic deformation to compensate for the deviation between the sealing surface angle processing, which is widely used at present.For more information about valves, please keep an eye on the valve knowledge section.
- Q: Generally, how big is the diameter of the installation flange plate gate valve?
- Under normal circumstances:Flanged gate valves for piping over DN50,DN50 (below) can be made of wire or gate valves, or flanged gate valves (flanged valves or welded gate valves)
- Q: What is the difference between gate valve Z41T and Z45T?
- The difference between Z41T and Z45T is that 41 is the dark rod, that is, the screw is not out of the turbine, and the 45 is the Ming bar, the screw out of the turbine outside, the price is also different?.
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gate valve ； CLASS150--2500 gate valve ;
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 1000 pc
- Supply Capability:
- 30000 pc/month
OKorder Service Pledge
OKorder Financial Service
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