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Diaphragm valve

Product Overview

When the inlet G6B41J/F standard normally closed pneumatic diaphragm valve is not ventilated, the valve body is normally closed and opened after ventilation.G6B41J/F pneumatic normally closed fluorinated diaphragm valves are designed to control non-corrosive or highly corrosive media. The valve body is lined or coated with a variety of alternative fluorinated plastics and are suitable for different operating temperatures and fluid lines.A diaphragm valve is a special form of shutoff valve whose opening and closing element is a diaphragm made of soft material that separates the body cavity from the bonnet cavity and drive components.The diaphragm separates the lower body cavity from the upper bonnet cavity so that parts such as the stem and disc located above the diaphragm are not corroded by media, eliminating the packing sealing structure and no media leakage.Drive the drive screw with compressed air as the power to move the spool up and down while pulling the diaphragm up and down to close and open it.

Structural characteristics

(1) Feedback signal of pneumatic valve adopts contactless sensing technology;
(2) When the air source fails, the valve can be opened or closed by operating the hand wheel;
(3) Membrane cylinder is used instead of piston cylinder, which eliminates the disadvantage of valve opening and closing due to easy leakage of piston rings;
(4) Pneumatic diaphragm valves can be equipped with feedback signals, limiters and positioners to meet the requirements of automatic control, programmable control or flow regulation.

Execution standard

Design and manufacture: GB12239,BS5156
Structure length: GB12221,BS5156
Flange connection: GB4216.4,BS4504
Test and inspection: GB/T13927,BS5156

Performance parameter

Nominal diameter: DN20-DN200
Nominal pressure: 0.6Mpa-1.6Mpa
Applicable temperature: ≤150℃
Applicable medium: non-corrosive fluid (without lining);
General corrosive fluid (rubber lining);
Strong acid base and various organic solvents (lined with fluorine)
Body material: cast iron, cast steel, carbon steel, stainless steel
Connection: Flange connection

Product Dimensions

DN 20 25 32 40 50 65 80 100 125 150 200
L(J type) 121 131 150 163 194 220 258 309 362 412 527
L(W type) 117 127 146 159 190 216 254 305 356 406 521
H 343 345 363 430 575 588 769 816 820 920 1010
WeightKG 6.3 7.3 8.3 14.3 26 30.8 64.9 70.3 80.7 131.2 212
Note: In addition, the size of the pressure diaphragm valve is 1.6Mpa. For drawings of higher pressure sizes, please contact us.
The opening and closing piece of the inlet diaphragm valve is a diaphragm made of soft material, which separates the body cavity from the bonnet cavity and the drive parts, and relies on a soft rubber or plastic film to control fluid movement.Diaphragm valves use corrosion-resistant lined bodies and corrosion-resistant diaphragms instead of spool assemblies, and use the movement of diaphragms to regulate, suitable for corrosive, viscous, slurry media.

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