Reliable High-Speed Protection

The main requirement of a modern shut-off valve is its reliable and fast acting emergency isolation on any backflow event. The 25.7 is designed to provide a sensitive, high-speed isolation function that reliably prevents the risk of backflow into a process chamber or pipe system.

The 25.7 HV Quick Shut-Off Valve is flow controlled. The direct operating design without any subsystem (sensor and actuator) provides high-speed isolation with low complexity and low failure risk. With less than 10 milliseconds from the initial backflow impulse to full isolation the 25.7 leads its class.

As a safety solution, a shut-off valve should ideally add no conductance barrier to the system. The 25.7’s special flow-optimized design sets the standard in this regard, delivering a perfect balance between high conductance and fast isolation.

When used in processes with by-products in the gas stream, e.g. foreline applications, any accumulation of contamination on a quick shut-off valve reduces conductance and can negatively influence its isolation capabilities. This process related challenge is adressed by a special surface coating which minimizes accumulation for most by-products significantly. An additional heating option is available to avoid process gas condensation at the valve surface.    

VAT 25.7 HV Quick Shut-Off Valve

open

VAT 25.7 HV Quick Shut-Off Valve - open

emergency closure in case of backflow

VAT 25.7 HV Quick Shut-Off Valve - closed

closed

The 25.7 HV Quick Shut-Off Valve is available in sizes from DN 50 - 160mm (2“ - 6”). The valve body is made of stainless steel. The standard flange is ISO-K for DN63 to DN160 (2½ “ - 6”) and ISO-KF for DN50 (2“). 

For applications with very aggressive process gases, FFKM seals are available.


Key features of the 25.7 HV Quick Shut-Off Valve

Features:

  • Flow-controlled movement
  • Outstandingly fast reaction time
  • Optimized conductance
  • Special surface coating to minimize by-product contamination

Benefits:

  • High level of protection
  • Extended lifetime
  • Easy installation
  • Low cost of ownership
Technical data
Sizes   DN 100 (4"), DN 160 (6")
Body Material   Stainless Steel
Standard Flanges   ISO-K
Leak Rate Valve Body
Valve Seat
< 1 × 10-9 mbar ls-1
< 1 × 10-6 mbar ls-1
Pressure Range   Vacuum to 1.2 bar (abs)
Differential Pressure On the Gate ≤ 1 bar
Conductance (laminar flow) DN 100
DN 160

6000 ls-1
20000 ls-1

Cycles until first Service   recommended after each backflow event
or with regular maintenance cycles
Temperature Valve Body ≤ 200 °C
Heating and Cooling Rate   ≤ 50 °C h-1
Material Valve Body
Gate
AISI 304 (1.4301)
AISI 304 (1.4301)
Seal Bonnet
Gate
FKM
FKM
Mounting Position   Fore line installation vertical only
gate facing chamber
Trigger Pressure ΔP at the Gate ≥ 5 mbar
Closing Time Gate Move Time
DN 100
DN 160

≤ 10 ms
≤ 15 ms
Weight

DN 100
DN 160

3.7 kg / 8.16 lbs
6.3 kg / 13.9 lbs

 

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