PRECESS - PRECESS Vacuum

Series VLAW ALBW UHV Angle Valve, Double Acting

Reliable, economical, general-purpose components for HV applications requiring cleanliness and corrosion resistance. Ideal for vacuum isolation or control in demanding installation situations. PRECESS provides HV angle valve solution for your system.

Series VLAW ALBW UHV Angle Valve, Double Acting

The main requirements of an angle valve in UHV applications are reliable performance, the rate of particle emission and activation, and the outgassing rate. The VLAW VLBW UHV Angle Valve series sets the standard in these areas. The series has been designed to reduce particle emission and activation and outgassing to a minimum.

Fitted with stationary rotatable CF-flanges and bonnet metal seals the valve series is suited for bake-out temperatures up to 200°C in the manual version and up to 150°C in the pneumatically actuated version.

The VLAW VLBW is ideal for the pumping and venting of vacuum systems. It resists high differential pressure. Tested in thousands of demanding applications under various process conditions the VLAW VLBW series has proven its outstanding reliability in UHV applications. The main requirements of an angle valve in UHV applications are reliable performance, the rate of particle emission and activation, and the outgassing rate. The VLAW VLBW UHV Angle Valve series sets the standard in these areas. The series has been designed to reduce particle emission and activation and outgassing to a minimum.

Based on a reliable and robust core design the VLAW VLBW UHV Angle Valve offers manual or pneumatic actuation in sizes from DN 16mm – 63mm.

The standard flange connector is CF-R, but customer specified flanges are possible. The VLAW VLBW is sealed with a metal bonnet seal and an FKM seal at the plate although other materials for the plate seal are an option. The feedthrough is bellows sealed.

A visual position indication as well as an electrical indicator are standard. The valve can be controlled by a solenoid valve either “on board” or in a distant location if required.

In addition to these standard options, the valve can be further customized.

Key features of the Series VLAW ALBW UHV Angle Valve, Double Acting

Features:

Low cost of ownership

Bonnet metal seal

Pneumatic drive with double action

Real bellows sealed feedthrough

Long maintenance free cycle

Angle modularization design

Benefits:

Resistance against high differential pressure

Optional sealing material FKM or FFKM

Large number of design options

TECHNICAL DATA

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SIZES		DN16 to 63mm
ACTUATOR	Pneumatic	Double acting
	Manual	With Removable Handwheel
BODY MATERIAL		Stainless Steel
FEEDTHROUGH		Bellow
LEAK RATE	Valve Body	< 5 × 10-10 mbar l/s
	Valve Seat	< 1 × 10-9 mbar l/s
PRESSURE RANGE		5 × 10-10 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		≥ 1,000,000
TEMPERATURE	Valve Body	≤ 150 °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	Metal
	Gate	FKM (Viton®) or on request
MOUNTING POSITION		Any
SOLENOID VALVE		24 VDC, 2.5 W (others on request)
POSITION INDICATOR: CONTACT RATING	Voltage	≤ 24 VDC
	Current	0-50 mA
VALVE POSITION INDICATION		Visual LED Lamp

Series VLAW ALBW UHV Angle Valve, Double Acting

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