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Pneumatic three-way control valve

6 Jul 2018 11:16:00 source:aen-valve.com browse:4088
  • Introduction
  • Technical Parameters

Pneumatic three-way regulating valve product description

ZJHF(H) pneumatic diaphragm three-way regulating valve is composed of a multi-spring pneumatic diaphragm actuator and a three-way split (combined) valve body. Pneumatic film actuators have the advantages of low height, light weight, large flow capacity, and easy installation and maintenance. Pneumatic three-way regulating valve is equipped with electro-pneumatic valve positioning or pneumatic valve positioner, which can realize automatic adjustment and control of fluid medium in process pipeline. It is widely used in precise control of process parameters such as pressure, flow rate of gas, liquid, steam and other media. Parameters such as temperature, level, etc. are maintained at a given value.

Pneumatic three-way control valve spool structure uses a cylindrical thin-walled window, and the use of valve side guide. The valve body has a three-way structure, ie, one in and two out (split type), two in and one out (combined type), so as to achieve fluid mixing heating or cooling, or fluid flow in different amounts, to meet the requirements of different industrial and mining use. Pneumatic three-way control valve body has the advantages of compact structure, light weight, sensitive operation, low pressure drop loss, large valve capacity, precise flow characteristics and easy maintenance. Pneumatic three-way regulating valve is used for proportional regulation or bypass regulation. It is especially suitable for the adjustment of the fluid temperature control system of oil industry heat exchangers. A three-way valve can replace two single-seat valves or two-seat valves and occupy space. Small size saves installation piping and costs.

  • valve body Parameters
  • Valve trim parameters
  • Actuator parameters
  • control valve Performance
Nominal diameter(DN) 20 25 32 40 50 65 80 100 125 150 200 250 300
Valve seat diameter(dn) 20 25 32 40 50 65 80 100 125 150 200 250 300
Rated flow
coefficient(KV)
Diverter valve 6.3 8.5 13 21 34 53 85 135 210 340 535 800 1360
Confluence valve - - - - - - 85 135 210 340 535 800 1360
Allowable pressure difference(MPa) 3.5 3.2 2.2 2.2 1.4 1.38 0.94 0.61 0.51 0.36 0.2 0.19 0.13
Nominal pressure(MPa) 1.6、2.5、4.0、6.4、10.0
With actuator type ZHA/B-22 ZHA/B-23 ZHA/B-34 ZHA/B-45 ZHA/B-56
Rated route(mm) 16 25 40 60 100
Valve cover form standard type(-17~+250℃)、High temperature type(+250~+450℃)、Low temperature type(-40~-196℃)、Bellows sealed type(-40~+350℃)
Capping form Bolt compression type
Seal packing V type PTFE packing、V type flexible graphite filler
Valve body material Cast Steel (WCB), Stainless Steel (CF8, CF8M, CF3, CF3M), Chrome Molybdenum Steel, Cast Steel Backing PTFE (WCB+F46)
Valve core form Double guide sleeve double valve core
Flow characteristics Linear, equal percentage
valve core material stainless steel (304、316、316L)
Configure Actuator
Category
ZHA/B Multi-spring film actuator
Actuator model ZHA/B-22 ZHA/B-23 ZHA/B-34 ZHA/B-45 ZHA/B-56
Effective area(cm2) 350 350 560 900 1400
route (mm) 10、16 24 40 40、60 100
Spring range(KPa) 20~100(standard)、20-60、60-100、40-200、80-240
Diaphragm material Nitrile rubber clip nylon cloth, ethylene propylene rubber clip nylon cloth
Air supply pressure 140~400KPa
Air interface RC1/4"
Ambient temperature -30~+70℃
equipped with accessories Locator, air filter pressure reducer, position valve, route switch, valve positioner, handwheel mechanism, etc.
Form of action Air-to-close (B)—Valve open (FO) when deaeration; Air-opening (K)—Valve off (FC) when deaeration
Item Without positioner With positioner
Basic error % ±5.0 ±1.0
Backlash % ≤3.0 ≤1.0
dead zone % ≤3.0 ≤0.4
Starting to
end point
deviation %
Air open Starting point ±2.5 ±1.0
Starting point ±5.0 ±1.0
Air shut Starting point ±5.0 ±1.0
end point ±2.5 ±1.0
Rated route deviation % ≤2.5
Leakage L/h 0.01%× Valve rated capacity
Adjustable range R 50:1
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