LoPro™ Soft-start Bellows Vacuum Isolation Valve

LoPro™ two-stage valves soft start the system in two easy steps without the use of secondary bypass lines, which clog easily and are expensive to maintain. In the first stage, the bypass valve pumps down slowly from atmospheric pressure to a vacuum pressure specified by the end-user. In the second stage, the main valve opens, allowing use of full pumping speed. The main valve is smaller, lighter, and lower in cost than similar competitive valves while offering improved reliability and increased uptime. The square cap design is easy to assemble and maintain.

NW25 - NW50
Two-stage with adjustable conductance for variable pump down speed
1,000,000 cycle rating (clean environments)
Reduces particulate contamination during early turbulent pumpdown

See All Features

Configuration Options

Please see the LPV2 datasheet for available product options.

Description
LPV2 Vacuum Isolation Valve, 2-stage, Low Profile, Soft Start

Specifications

Type
Low-profile, Two-stage, Soft-start, Bellows-sealed Isolation Valves
Vacuum Range
Atmosphere to 1.0 x 10^-9 Torr
Port Size
NW25, NW40, NW50
Helium Leak Rate
1.0 x 10-9 std cc/sec
Cylinder Volume
Main cylinder: 1.2 - 6.4 in³, depending on configuration
Bypass: 100 in ³
Cylinder Air Pressure
90 psig ±30 psig
Limit Switch Rating
5A - 250 VAC

Single Pole, Single Throw
5A - 30 VDC
Blow-By Pressure
Main: 80 - 45 psi, depending on configuration
Bypass: 45 psi
Actuation Time
Main: 40 - 160 msec to open, 90 - 220 msec to close, depending on configuration
Bypass: 100 msec (both)
Maximum Internal Spring Closing Pressure
38 - 60 psia, depending on configuration
Maximum Bakeout Temperature
150°C
Typical Life
1,000,000 cycles

Features

Two-Stage Valve Components

The LoPro Two-Stage Valve is a normally closed, pneumatically actuated valve at both stages. Within the bypass valve, a removable, interchangeable small orifice is provided to allow for variable slow pump-down times. The standard bypass orifice diameter is 0.225”. An optional thumbscrew or micrometer head is available for the bypass valve for flow adjustment by stroke limitation. The formed 321 stainless steel bellows prevents outgassing, virtual leaks, and particle entrapment between bellows convolutions and extends the valve’s cycle life. The optimized bellows’ stroke length assures a longer cycle life while maintaining a high conductance.

304 Stainless Steel Valve Body

The valve body is comprised of a high grade, corrosion resistant, 304 stainless steel using clean, tungsten inert gas (TIG) welding to ensure significantly fewer entrapment areas, resulting in less contaminant build-up. Select the LoPro Two-Stage Valve in a right angle or inline version and a port diameter of either 1, 1½, or 2 inches. Standard port interfaces include ISO-KF and CF flanges and weld stubs. Elastomer seal choices, for both stages of the valve, include Viton® or Chemraz®, which have a higher chemical resistance. Vacuum exposed parts are clean and free of lubricants. Options include an air solenoid for electropneumatic control and a limit switch for remote indication of the main valve’s position.

Accessories

Replacement Solenoids

Description	Compatibility	Price
100008163Solenoid Valve, Replacement, 24 VDC, 7 Watt	UNIVERSAL	$179
100008164Solenoid Valve, Replacement, 24 VAC, 50-60 Hz, 6 Watt	UNIVERSAL	$221
100008165Replacement Solenoid Valve, 120 VAC, 50-60 Hz, 7.5 Watt	UNIVERSAL	$233
100008166Solenoid Valve, Replacement, 208 VAC, 50-60 Hz, 7.5 Watt	UNIVERSAL	$153
100008167Solenoid Valve, Replacement, 220-240 VAC, 50-60 Hz, 7.5 Watt	UNIVERSAL	$189
100008539Solenoid Valve, Replacement, 12 VDC, 7 Watt	UNIVERSAL	$111

Valve Seals

Description	Compatibility	Price
100008619Viton Seal Set, LoPro 2-Stage Valve, NW25 Port	UNIVERSAL	$39
100008624Viton Seal Set, LoPro 2-Stage Valve, NW40 Port	UNIVERSAL	$39
100008629Viton Seal Set, LoPro 2-Stage Valve, NW50 Port	UNIVERSAL	$39
100008623Chemraz Seal Set, LoPro 2-Stage Valve, NW25 Port	UNIVERSAL	$624
100008628Chemraz Seal Set, LoPro 2-Stage Valve, NW40 Port	UNIVERSAL	$833
100008633Chemraz Seal Set, LoPro 2-Stage Valve, NW50 Port	UNIVERSAL	$938

Limit Switches

Description	Compatibility	Price
100002227Limit Switch Kit, High Cycle, LoPro, LoPro 2-stage Valves, NW25	UNIVERSAL	$168
100002228Limit Switch Kit, High Cycle, LoPro, and LoPro 2-stage Valves, NW40	UNIVERSAL	$158
100002229Limit Switch Kit, High Cycle, LoPro, and LoPro 2-stage Valves, NW50	UNIVERSAL	$168

Internal Rebuild Kits

Description	Compatibility	Price
100010104Valve Rebuild Kit with Viton Seal Set, Lopro Single, 2-stage Pneumatic Valves, NW25	UNIVERSAL	$368
100004938Bypass Valve Rebuild Kit, Viton Seals, 2-stage and LoPro Two-stage valves with Thumbscrew	UNIVERSAL	$357
100010103Valve Rebuild Kit with Viton Seal Set, Lopro Single and Two Stage Pneumatic Valves, NW40	UNIVERSAL	$385
100004937Bypass Valve Rebuild Kit, Cv, IDA & Lopro 2-Stage Valves	UNIVERSAL	$300
100010102Valve Rebuild Kit with Viton Seal Set, Pneumatic Lopro Single & 2-stage Valves, NW50	UNIVERSAL	$616
100004920Bypass Valve Spare Parts, Thumb Screw, Viton Seals, Conversion Kit	UNIVERSAL	$448
100004939Bypass Valve Rebuild Kit, Viton Seals, 2-stage, CV, IDA, LoPro 2-stage valves with Micrometer	UNIVERSAL	$375
100004919Bypass Valve Spare Parts, Normally Closed, Viton Seals, Conversion Kit	UNIVERSAL	$375
100004921Bypass Valve Spare Parts, Micrometer, Viton Seals, Conversion Kit	UNIVERSAL	$838

LoPro™ Soft-start Bellows Vacuum Isolation Valve

LoPro™ Soft-start Bellows Vacuum Isolation Valve

Configuration Options

Specifications

Features

Two-Stage Valve Components

304 Stainless Steel Valve Body

Accessories

Replacement Solenoids

Valve Seals

Limit Switches

Internal Rebuild Kits

Resources

Literature

Manuals

Related Products

ILP Integrated Soft-start Vacuum Isolation Valves

LoPro™ Bellows Vacuum Isolation Valves

Cv™ Compact Bellows Vacuum Isolation Valves

CRV Corrosion Resistant Vacuum Isolation Valves