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Single-seated Control Valves  DN 15-150 Single seat valve

Single-seated Control Valves DN 15-150 Single seat valve

Single seat valve housings of different nominal sizes, pressure levels and materials are available to enable optimum adaptation to the operating data.

Description

Single-seated control valves 

Single seat valve housings of different nominal sizes, pressure levels and materials are available to enable optimum adaptation to the operating data. Additionally, various internal trims and different Kvs values are possible for every nominal diameter. The appropriate type and size are defined using the operating data.
Whether a
straight-through valve, a three-way mixing valve or a three-way distributing valve is needed depends on the desired influence on the energy flow.


Control valve 23/25 Single seat straight-way valves and three-way valves
— Size DN 15 ... DN 150
— With pneumatic actuator
Various housing materials
— Grey cast iron, cast steel or stainless steel
Various internal trim options
1) Parabolic or slotted cone
2) Seat ring with metallic or soft seal
3) Various Kvs values for every nominal size
4) Linear or equal-percentage characteristic
Several stem
seal options
1) Maintenance-free PTFE lip rings
2) Pure graphite rings
3) Hermetic bellows seal
Integral positioner
1) With follower pin for stroke measurement free of play
2) Protected point for mechanical stroke measurement inside the yoke (complies with regulations for prevention of accidents)
3) No external tubing required due to internal air channels


Functional description
The ABB single-seat straight-way valve 23/25 is a final control element for continuous control through variation of the media or energy flow in tubes. Actuation is through compressed air from a multi-spring diaphragm actuator.

The medium, the operating temperature and the desired environmental protection (e.g. through use of a hermetic bellows seal for poisonous substances) are the decisive criteria for selecting the appropriate stem seal. 

The multi-spring diaphragm actuator combines a compact design with a low height. The valve is actuated through compressed air of max. 6 bar, and returned by spring force. The controlling torque can be adapted to the application by using the appropriate actuator size (diameter) and number of return springs.


Technical data
Housing
Size DN 15 ...150 
Flanges according to DIN
Operating pressure according to DIN 2401 and observing the housing material 
Material:
Grey cast iron 0.6020 PN 16, 0...200°C (for
straight-way valves DN 15...50 material 06025)
Cast steel 1.0619 PN 40, -10 ... +400°C
Stainless steel 1.4581 PN 40, -10 ... +400°C
Seat
Stainless steel 1.4571, screwed in position
Cone
Stainless steel 1.4571
Single-guide parabolic cone for
single-seat straight-way valve, linear or equal percentage valve characteristic or Double-guide slotted cone for three-way valve, with linear characteristic
Setting ratio: 40 : 1
Leakage rate (relative to the Kvs value)
<0.01% with metallic seal
< 0.005% with ground-in cone
< 0.001% for cone with soft seal
Valve stem
Stainless steel 1.457, press rolled
Stem seal
Packed gland with pure graphite packing for -10 ... +400°C
Mounting
Flange connection according to DIN
Freely insertable in pipe (no mounting on actuator)
Actuator vertically upwards (standard position)


You may email to postmaster@wtindustrialeqpt.com for quotations and also visit http://www.wtindustrialeqpt.com/valves/ for more information. 

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