Brief introduction of pneumatic membrane three-way regulating valve
Pneumatic membrane three-way regulating valve is mainly used to divide an inlet fluid into two outlet fluids or to synthesize two inlet fluids into one outlet fluid. Three-way valve is divided into confluence control valve, shunt control valve. Valve size, pressure difference small confluence valve can also be used as a shunt valve, but the valve size is large. Do not use diverter valves in high differential pressure situations.
Pneumatic membrane three-way regulating valve  type:
shunt three-way regulating valve
junction three-way regulating valve
Pneumatic membrane three-way regulating valve  body
Type  : Three-way casting structure
Nominal diameter: DN20-DN200
Nominal pressure: ANSI150, 300, 600LB
                  JIS10、16、20、30、40K
                  PN1.6、2.5、4.0、6.4MPa
Connection: Flanges: FF, RF, RJ and LG
Flange standard: ANSI B16.5, JIS B2201
                  JB/T79.1 PN1.6MPa,JB/T79.2
 Thread         : DIN, NPT, RC, BSP, G, etc.
 Welding         : GB12224 -89
Sealing surface form: PN16 convex, PN40 concave
Material  : WCB, 304, 316, 316L
Upper valve cover: standard type (-20℃~+200℃)
 Low         temperature type (-60℃~-196℃)
 Heat         dissipation type (-40℃~450℃)
Pneumatic diaphragm three-way regulating valve bellows seal type
Gland type: pressure plate type
Filler  : V-fluorotetrafluoroethylene, flexible graphite
Pneumatic diaphragm three-way regulating valve valve inner assembly
Valve core type: single seat plunger type
Spool seat: 304, 316+STL
Flow characteristics: equal percentage, linear, fast open
Pneumatic membrane three-way regulating valve actuator
Type  : Multi-spring diaphragm actuator
Form of action: positive action, reaction
Diaphragm material: NBR reinforced polyester fabric
Spring range: 20~100KPa, 40~200KPa, 80~240KPa,
Air supply pressure: 0.14, 0.16, 0.28, 0.40MPa
Pneumatic membrane three-way regulating valve action form
Air close FO (with positive action actuator) when the air source failure, vertical direction through.
Air-open FC (with reaction actuator) When the air source fails, the horizontal direction is open.
Accessories (configured on request)
Electrical positioners, air filtration pressure relief valves, handwheel mechanisms, limit switches, solenoid valves, position retention valves and others
Performance of pneumatic diaphragm three-way regulating valve
Rated KV value: refer to table
Flow characteristics: linear, equal percentage, fast open
Adjustable range: 30:1
Leakage class: Metal seal: less than 0.01 (ANSI B16.104-1976 Class IV)
Soft seal: less than 0.00001%
Return  error: less than 1% of full stroke (with positioner)
Less than 3%-5% of full stroke (without positioner)
Basic error: less than 1% of full stroke± (with positioner)
Less than 5% of full stroke (without positioner)