Introduction about Pneumatic cylinder operated flanged knife type gate valve

Pneumatic cylinder operated knife type gate valve is one knife type gate valve which is operated by a pneumatic cylinder. Pneumatic actuated knife type gate valve is one kind of relatively complicated automatic controlling device, which is mainly composed of the pneumatic cylinder and the knife type valve body. Pneumatic cylinder actuated knife type gate valve is mainly used for pipelines which requires fast cutting off and connecting. 

Simple introduction of pneumatic operated knife gate valve: 

Pneumatic cylinder operated knife type gate valve, also known as pneumatic cylinder operated slurry valve and pneumatic plug valve, is suitable for pipelines with mediums like syrup, pulp, sewage, coal slurry, ash, dust, slag-water mixture,etc. Pneumatic cylinder operated knife type gate valve can be used for cutting off and throttling the mediums. That pneumatic actuated knife type gate valve can be installed horizontally and also be suitable for inclined installation. 

Main technical parameters of pneumatic operated knife type gate valve: 

1. nominal diameter of pneumatic actuated knife gate valve: DN50-DN2000mm

2. Nominal pressure of pneumatic actuated knife gate valve: 0.6MPa、1.0MPa、1.6MPa、2.5MPa、150Lb

3. Applicable working temperature of pneumatic knife gate valve: -38~+1100℃(the specific working temperature range depends on the sealing pair material and the properties of the medium) 

4. End connect flange: ANSIB16.5、GB/T9113、JB/T79、HG、SH、JIS、DIN、NF、BS

5. Body material of pneumatic actuated knife gate valve: cast iron, carbon steel WCB, ZG1Cr18Ni9Ti、ZG1Cr18Ni12Mo2Ti、CF8、CF8M、CF3、CF3M、2Cr25Ni20. 

6. Sealing structure of pneumatic knife gate valve: metal hard sealing*H,Y) and soft sealing(NBR, PTFE, FPM). 

7. Leaking grade: metal hard sealing(Grade D, liquid 0.1XDN mm3 /s), soft sealing:Grade A( zero leaking). 

8. shell testing pressure: 1.5Mpa/2.4Mpa

9. sealing testing pressure: 1.1Mpa/1.8Mpa. 

10. Applicable medium of pneumatic knife gate valve: pulp, sewage, coal slurry, ash, slag-water mixture. 

Material for main parts in pneumatic actuated knife gate valve: 

Part name	Body and bonnet	Knife wedge	Valve stem	Sealing surface
Material	Stainless steel, WCB, cast iron	Carbon steel, stainless steel	Stainless steel	Natural rubber, PTFE, stainless steel, hard alloy.

Standards for pneumatic actuated knife gate valve:

1. design and fabricating standard:  JB/T8691; MSS SP-81

2. Face to face standard: GB/T12221; MSS SP-81

3. flange end connect standard:  JB/T79; ANSI B16.5

4. inspect and test standard: JB/T8691 MSS SP-81

Advantages of pneumatic cylinder actuated knife type gate valve: 

1. the liftable sealing surface in the pneumatic cylinder operated knife type gate valve can scrape the adhesive on the sealing surface and automatically remove the sundries. 

2. The knife wedge of the pneumatic actuated knife gate valve is made of stainless steel material, which can prevent the sealing leakage caused by medium corrosion. 

3. The pneumatic cylinder actuated knife type gate valve has short face to face structural length, which can save the raw material and the installation space, and also effectively support the pipeline strength. 

4. The pneumatic actuated knife gate valve is using the scientific upper sealing stuffing box design, which makes the upper sealing effect more effective and durable. 

5. The triangular bracket saves the raw materials and guarantees the required mechanical properties. 

6. The guide block on the valve body of the knife gate valve makes the knife wedge move correctly; the extrusion block can ensure the effect sealing of the valve knife wedge plate. 

7. The design of the stiffener in the valve body increase the strength of the valve body of the pneumatic actuated knife gate valve. 

8. The stainless steel valve stem in the pneumatic knife gate valve is more durable, and the use of the stud screw makes the opening and closing more quickly. 

9. Apart from the pneumatic cylinder actuators, the other operating devices can also be selected for the knife type gate valves, like the manual hand wheel, chain hand wheel, electric actuated, hydraulic actuated,etc. 

Details required before purchasing the pneumatic actuated knife gate valve: 

1. when purchasing the knife gate valves, the customer should indicate the nominal diameter of the knife gate valve, nominal pressure of the knife gate valve, and the required standard for the end connect. 

2. If the customer has some special requirements for the knife gate valves, the parameters such as the special size and special material requirements should be indicated. 

3. If there is no special requirements for the operating device of the knife gate valve, it will follow the factory’s standard. 

4. The customer can supply the medium, temperature, pressure requirement, the manufacturer will provide options for what kind of knife gate valve should be selected. 

Belo Valve is a more than 15 years professional manufacturer for industrial valves, like butterfly valves( center line wafer butterfly valve, manual butterfly valve, lever driving butterfly valve, butterfly valve with worm gear box, lug type butterfly valve, soft seal butterfly valves, hard seal butterfly valves, flange butterfly valves, ductile cast iron butterfly valves, stainless steel butterfly valve), gate valves(including DINF4 gate valves, DINF5 gate valves, DIN3352 gate valves, rising stem gate valves, non rising stem gate valves, soft seal gate valves, hard seal gate valves, hydraulic gate valves, sluice valves), globe valves( DIN globe valves, bellows globe valves, electric globe valve), ball valves( welded ball valves, soft seal ball valves, stainless steel ball valves, WCB ball valves, ductile cast iron ball valves, API ball valves), check valves( wafer type check valves, swing check valves, rubber disc check valves, ball type check valve, foot valve/bottom valve), fire protection valves( grooved butterfly valves, grooved gate valves, grooved strainers, grooved check valves), hydraulic control valves, etc.

Apart from Pneumatic cylinder operated knife gate valves, there are also electric actuated knife gate valves, manual hand wheel operated knife gate valves, chain operated knife gate valves, manual lever operated knife gate valves, for more technical parameters and price, kindly contact us: