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SHANGHAI HUIXUAN VALVE

Mobile:+86-17717520739
Wechat:17717520739
Email:info@shxvalve.com

Address: NO.720, Suide Road, Jiading District,Shanghai, China.

 

Dual Expanding Double Block and Bleed Plug Valve

Model:

  • Port size:DN50-DN600
  • Pressure:CL150-CL2500
  • Medium:Water,steam,oil,gas,etc.
  • Temperature :-40~200℃,-60~450℃
  • Body material:WCB,WCC,LCB,CF8,CF8M,etc.
  • Description:China Double Block and Bleed Plug Valve manufacturer, factory and supplier.

Double Block and Bleed Plug Valve manufacturer, factory and supplier. Dual Expanding Double Block and Bleed Plug Valve is a general plug valve used to cut the connection of pipelines medium that is used in various industries such as petroleum, chemical industry, chemical fertilizer, power industry etc under nominal pressure of CLASS150-900LBS and working temperature of -29-180 °C.

The action of two sealing vanes of Dual Expanding Double Block and Bleed Plug Valve mounted on the plug is the key to the working principle of the double block and bleed valve.The two separate sealing vanes of Dual Expanding Double Block and Bleed Plug Valve are compressed on upper and lower ends of the valve bore(double block], and when the valve is closed, the bleed valve will be opened to check the sealing effect(bleed].

The advantage of Dual Expanding Double Block and Bleed Plug Valve is that, during the opening and closing of valve, the valve disc and valve seat is separated and there is no friction and thus sealing face has no abrasion in the process; at the same time, soft seal is applied for sealing, so that there will be no leakage in the process of closing.


Dual Expanding Double Block and Bleed Plug Valve Technical Specification:

Structural information          . BB-BG
Driving manner Handwheel, bevel gear, electric-actuated
Design standard AP1599, API6D
Face to face ASME B16.10
Flange end ASME B16.5
Test&inspection AP1598, API6D

Note: the size of serial Dual Expanding Double Block and Bleed Plug Valve connecting flange can be designed according to customers’ requirement.

Dual Expanding Double Block and Bleed Plug Valve material:

NO. Part name Material
1              . Bottom                       . ASTM A216-WCB, ASTM A351-CF8,CF8M,CF3,CF3M
2 Oring Butyl rubber NBR, PTFE
3 Sealing ring Fluorine rubber Viton, PTFE
4 Plug ASTM A216 WCB+N, ASTM A351-CF8, CF8M, CF3, CF3M
5 Body ASTM A216-WCB, ASTM A351-CF8, CF8M, CF3, CF3M
6 Bolt ASTM A193-B7, A320-B8, A193-B8M
7 Nut ASTM A194-2H, A194-8, A194-8M
8 Cover ASTM A216-WCB, ASTM A351-CF8, CF8M, CF3, CF3M
9 Packing Flexible graphite+stainless steel, PTFE
10 Gland ASTM A216-WCB, ASTM A351-CF8, CF8M, CF8M, CF3, CF3M
11 Handwheel ASTM A536 Gr.60-40-18, A216-WCB
12 Yoke nut Copper alloy ZQA19-4
13 Yoke nut bushing ASTM A216-WCB, ASTM A351-CF8, CF8M, CF3, CF3M
14 Yoke ASTM A216-WCB, ASTM A351-CF8, CF8M, CF3, CF3M
15 Stem ASTM A 182-Gr.F6a, ASTM A 182-F22, ASTM A351-CF8, CF8M, CF3, CF3M
16 Guiding stud ASTM A 182-Gr.F6a, ASTM A 182-F22, ASTM A351-CF8, CF8M, CF3, CF3M
17 Pin ASTM A 182-Gr.F6a, ASTM A 182-F22, ASTM A351-CF8, CF8M, CF3, CF3M
18 Disc ASTM A 182-Gr.F6a, ASTM A 182-F22, ASTM A351-CF8, CF8M, CF3, CF3M


Dual Expanding Double Block and Bleed Plug Valve Structural Features:

1. In the ​Dual Expanding Double Block and Bleed Plug Valve opening/closing process, there is no contact between the sealing surfaces of the valve body and the vane, so the sealing surfaces suffer neither friction nor wear, contributing to the general twin seal plug valve's long service life and small opening/ closing torque;

2. For the ​Dual Expanding Double Block and Bleed Plug Valve maintenance, there is no need to remove the valve from the pipeline but just remove its bottom cover to replace the vane pair, thus very easy for the maintenance;

3. Dual Expanding Double Block and Bleed Plug Valve  body and plug are full-bore so that the medium can flow through the valve without any flow resistance.and it's also possible to clean the pipeline to overcome the shortcomings of the reduced port valve;

4. Dual Expanding Double Block and Bleed Plug Valve cavity is plated with hard chrome and the sealing area is hard and smooth;

5. The elastic seal on the vane is made of the fluorine rubber and molded and formed in a groove of the vane surface.The fireproof metal-to-metal seal is used as the backing of the elastic seal;

6. Dual Expanding Double Block and Bleed Plug Valve is provided with an automatic bleed device(optional) which can prevent the abnormal pressure rise of the valve cavity and check the valve's effect after the valve is completely closed;

7. Dual Expanding Double Block and Bleed Plug Valve opening/closing indicator is in sync with the opening/closing position and can accurately display the valve's opening/closing status.


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