The VLAF HV Open Rate Angle Valve series delivers key performance indicators reliability and variability both. Tested in thousands of demanding applications under various process conditions the VLAF series has proven its outstanding reliability and variability.
With its design options in actuation manual, various flange connections, body materials and sealing materials, nearly every requirement can be met.
The VLAF is ideal for the visible open rate of pumping and venting of HV systems. It resists high differential pressure and is fitted with a bellows-encapsulated feedthrough for particle-sensitive applications. The bellows encapsulation also prevents pressure peaks in any valve position.
The manual version is controlled by a removable hand wheel that provides good grip and precise control with a clear end stop position, avoiding the risk of over twisting. It is designed to meet specific requirements in low power consumption, high cycle time, reduced vibration and low noise.
The manualis available in sizes from DN 16 to DN 50 mm.
The VLAF can be selected in aluminum or stainless steel in various specifications. The standard options for flange connectors are ISO-KF or ISO-K. The VLAF can be used in different temperature regimes depending on the sealing elastomer chosen. In addition to these standard options further customization is possible.
|
SIZES |
|
DN16 to 50mm |
|
ACTUATOR |
Manual |
With Removable Handwheel |
|
BODY MATERIAL |
|
Aluminum or Stainless Steel |
|
FEEDTHROUGH |
|
Bellow |
|
LEAK RATE |
Valve Body |
< 1 × 10-9 mbar l/s |
|
|
Valve Seat |
< 1 × 10-9 mbar l/s |
|
PRESSURE RANGE |
|
1 × 10-8 mbar to 2 bar (abs) |
|
DIFFERENTIAL PRESSURE |
In Opening Direction |
≤ 1.2 bar Max. |
|
|
In Closing Direction |
≤ 2 bar Max. |
|
DIFFERENTIAL PRESSURE ON THE PLATE |
|
≤ 1.2 bar |
|
CYCLES UNTIL FIRST SERVICE |
|
≥ 300,000 |
|
TEMPERATURE |
Valve Body |
≤ 120 °C |
|
|
Actuator |
≤ 60 °C |
|
MATERIAL |
Valve Body, Plate |
AlSI 304 (1.4301) |
|
|
Shaft |
AlSI 304 (1.4301) |
|
|
Bellows |
AISI 633(AM350) or AISI 316L (1.4404, 1.4435) |
|
SEAL |
Bonnet |
FKM (Viton®) or on request |
|
|
Gate |
FKM (Viton®) or on request |
|
MOUNTING POSITION |
|
Any |
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