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Pneumatic flang ball valve

28 Apr 2018 20:33:00 browse:10246
  • Introduction
  • Technical Parameters

Product overview of pneumatic flange ball valve

The pneumatic flange ball valve is composed of high precision pneumatic actuator and precision cast ball valve. Mainly divided into pneumatic valve and pneumatic valve cut off two categories. Pneumatic flange ball valve has compact structure, small volume, reliable operation, low flow resistance coefficient, good sealing, easy maintenance, the utility model has the advantages of convenient installation, strong adaptability, etc. Pneumatic switch ball valve can be equipped with travel limit switch, solenoid valve, pressure reducing valve and 0.4-0.7 MPa air source to achieve switching operation. And send out two pairs of passive contact signal indicating the valve switch. Pneumatic valve switch is particularly suitable for medium is viscous, with particles, fiber properties of the occasion.Pneumatic flange ball valves are widely used in petroleum, chemical, teaching equipment, light industry, high-voltage equipment, pharmaceutical, paper and other industrial automatic control systems for long-distance centralized control or local control.

Characteristics of pneumatic flange ball valve products.

(1) small fluid resistance, valve fluid resistance is the smallest of all types of valves in a, even shrinking ball valve, the fluid resistance is quite small.

(2) thrust bearings reduce stem friction torque, allowing long-term operation of stem balance flexibility.

(3) the sealing performance of the valve seat is good. The sealing ring made of PTFE and other materials is easy to seal. And increase.

(4) the valve stem is sealed reliably, because the valve stem only makes the rotation movement but does not make the lifting movement, the valve stem packing seal is not easy to damage. And the sealing capacity increases with the pressure of the medium.

(5) Since PTFE and other materials have good self-lubrication, the friction loss with the ball is small and the service life of the ball valve is long.

(6) Bottom-mounted stems and stem heads prevent the valve stem from being ejected. If the fire causes the stem seal to fail, a metallic contact can also be formed between the raised step and the valve body to ensure that the stem is sealed.

Main technical parameters of pneumatic flange ball valve
Nominal size DN(mm) 15 20 25 32 40 50 65 80 100 125 150 200
Rated discharge
coefficient KV
21 38 72 112 170 273 384 512 940 1452 2222 3589
PN1.6、2.5、4.0、6.4 MPa;ANSI 150、300LB
Allowable pressure
( MPa)
≤Nominal pressure
Body form  
Connection form flange、welded、threaded
Core form "O"type spherical valve core
Seal packing V type PTFE packing、flexible graphite filler, etc
Approximate quick type
Range of motion 0~90°
Leakage Q According to GB/T4213-92,less than 0.01% of rated kv
Adjustable extent 250:1 350:1
Can be equipped with at, gt, ST, aw and other series of single-acting and double-acting pneumatic actuators
Control mode Switch type ( switch two-position control ), regulating type ( 4 ~ 20ma control )
Technical parameters of pneumatic flange ball valve actuator
Actuator model At, gt, ST, aw series single-acting and double-acting pneumatic actuators
Supply pressure 0.4~0.7MPa
Air source interface G1/4"、G1/8"、G3/8"、G1/2"
Ambient temperature -30~+70℃
Action form Single acting actuator: air shutoff type (B ) - valve position open (FO ) when air is lost; Air opening (K) - valve position closing (FC ) in case of air loss
Double - acting actuator: air shutoff type (B ) - valve position maintenance ( FL ) in case of air loss; Air open type ( K ) - valve position maintenance during air loss (FL)
Accessory Positioner, solenoid valve, air filter pressure reducer, retaining valve, travel switch, valve position transmitter, handwheel mechanism, etc.
Material of main parts of pneumatic flange ball valve
Part name Materials
body WCB 304(CF8) 316(CF8M) 316L(CF3M)
sphere 2Cr13+ nitridation treatment 304 316 316L
steam 2Cr13 304 316 316L
Seat Sealing ring PTFE、PPL、Metal seal (hard alloy)
packing V type PTFE packing、flexible graphite
Main performance specifications for pneumatic flange ball valves
Nominal size DN(mm) DN15-300
PN(MPa) 1.0 1.6 2.5 4.0 6.4
Test pressure Strength test 1.5 2.4 3.75 6.0 9.60
Pressure test 1.1 1.76 2.75 4.4 7.04
Low pressure
airtight test
Water, oil, steam, nitric acid ( temperature ≤ 200 ℃ ), acetic acid ( temperature ≤ 200 ℃ )

Pneumatic flange ball valve product selection

(1)body parameters: nominal diameter, working pressure, process media, use occasions, body material series parameters.

(2)actuator parameters: actuator form, control mode, control signal (4-20mA, 1-5V), mode of operation (gas-open, gas-off-type) as far as possible to provide more detailed technical parameters to facilitate our business and technical personnel for your accurate selection. If you have any questions, you can call us, we will do our best to provide you with quality service!

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