IVWF Variable Flow

The IVWF series shutoff valves have a simple structure, and can be installed in the vacuum exhaust line. The valve shuts off flow when the flapper type mechanism is rotated 90°.

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FEATURES

These valves feature compact size and light weight due to their simple structure, and attaching one of these valves is easy.
Minimal face-to-face dimension makes it easy to install in the tight space.
The manual valves control the amount of flow by adjusting the degree of opening and can be set to an arbitrary degree of opening by fixing a lock screw.
The structure of the throttle valves enables the degree of opening to be reproduced by graduations on the micrometer handle, and micro-adjustments is made possible by a differential screw mechanism.

PRECAUTIONS

The valves are designed to be used under atmospheric pressure. Usage such as under vacuum vessels are not guaranteed.
For high temperature applications, please select appropriate material for air-fittings and tubes to assure proper performance.
For atmospheric release applications, contact your sales representative.
Seal (A) affixed to the valve body shows the direction in which higher vacuum is retained during the process using the valve. Place the parts requiring high vacuum on the side marked “HIGH VACUUM SIDE”. To maintain the chamber at high vacuum, place the chamber on the “HIGH VACUUM SIDE” and the pump on the opposite side.

Product Selection

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Product Details

Specifications
Size		25A	50A	80A	100A
Orifice Inch(mm)		φ1.30 (33.0)	φ2.02 (51.3)	φ3.07 (78.0)	φ3.94 (100.0)
Pressure Range		1.4x10^-10 psia (1x10^-6 ~2x10⁵ Pa (abs) [0.1MPa(G)])
Maximum Pressure Differential at the Seat		14.6 psig (0.101 MPa(G)) (Positive / Back Pressure)
Fluid Temperature		-15~100ºC
Leak Rates	Across the Seat He Leak Rates	≤ 1×10^-9 sccs (≤ 1×10^-10 Pa·m³/sec)
	Inboard He Leak Rates	≤ 1×10^-9 sccs (≤ 1×10^-10 Pa·m³/sec)
Cycle Life		Tested for 1 million cycles in atmospheric pressure
Connection		Compatible with ISO KF flange, JIS VF/VG flange, and other standard connections

PRODUCT CODE KEY

Model

Size

Operation

Valve Material

Connection (Seat Side)

Connection

Seat Material

Custom Specifications

Proximity Switch

Proximity Switch Categories

Open/Close Display Plate※

IVWF

Specific Code

IVWF - I-shape Vacuum Butterfly Valve

25: 25A
50: 50A
80: 80A
100: 100A

F: Flow Control

S: Straight

NW: ISO KF Flange
VF: JIS VF Flange
VG: JIS VG Fange
CF: ConFlat Flange

Not Shown: Same Cases As (Seat Side) Omitted
F: JIS VF Flange
G: JIS VG Flange

F: Fluorine Rubber

Not Shown: Standard Products Are Omitted

Not Displayed: No Switch
SO: With Switch on Fully Open Side
SC: With Switch on Fully Closed Side
W: With Fully Open/fully Closed Switches

NR: PD31L3 Switch with Contacts (2 wires)
NS: PE34L3 Switch with Contacts (2 wires)

OC: With Open/Close Display Plate
Not Shown: Without Open/Close Display Plate

*We handle materials and shapes other than those noted.
*We also handle these valves with heaters attached as special order items. For details please ask to the sales representative.
※Pneumatic only