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Pneumatic Bellows Seal Control Valve


CEPAI Pneumatic bellows seal control valve is a top entry globe
type valve, which is manufactured under ISO 9001 quality assurance
system. The body channel is streamlined by S shape with low
pressure loss, high capacity, wide regulating range, and high
accuracy in flow characteristics. Bellows seal bonnet can reduce
the possibility that the processing medium let out from the backlash
of stem moving. This is one the remarkable characteristic of bellows
seal valve. As the deformation and anti-ageing of the bellows seal
control valve, these kinds of valve have totally overcame the
disadvantage of packing ageing and sensitivity of temperature
difference of packing seal valve. It has a wide application in the
auto control systems with the special rare medium, such as poison,
strong corrosion, and radioactivity. The plug features with guiding
area and good vibration resistance. The control valve is equipped
with mult-spring diaphragm actuator and compact in structure as
well as big in output force. This valve is designed to control a broad 
variety of fluids, like steam, water, most of the medium and gases.

Design Features
· Reduced trim can be chosen to provide wide capabilities for site applications 
· Bellows seal bonnet to prevent the leakage from the backlash of stem moving
· Pneumatic diaphragm actuator for wide application
· Balanced trims are suitable for high pressure drop and shutoff 
· Hardened trims to handle high pressure drop applications
· Bellows seal for special medium
· Extended bonnet for low temperature 
· Finned bonnet for high temperature 
· Higher maximum valve flow coefficients 
· Bigger body volume to reduce cavitations

Technical specifications
Body type: Globe control valve type
Size: DN15~DN250 (3/4" to 10")
Pressure Class: PN16,PN40,PN64
  ANSI 150,ANSI300,ANSI600
Characteristics: Equal Percentage, Linear, quick open
Body Materials: ZG230~450, ZG1Cr18Ni9, WCB, LCB, CF8M,
Trim materials: 304, 316, 304L, 316L
Temp range: -196°C to +566°C
Connection: Flanged, Socket welding, Butt welding
Leakage: Class IV (Metal seat, standard), Class V,
  Class VI (Soft seat, zero leakage)
Actuator: Pneumatic diaphragm actuator, Piston
Positioner: High Performance Smart positioner (Explosive
  proof and HART Protocol are available)

Pneumatic Bellows Seal Control Valve.PDF

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