Product Made in Japan
Manufacturer: IHARA SCIENCE CORPORATION
Model: DVF Series
Features
The KAIHEI-KUN Series features pipe joints with internal metal diaphragms offering lighter weights, compact size, and outstanding cost-performance compared to conventional metal diaphragm valves. Thanks to a new concept featuring pipe joints as the key element, valve functions are on the same level as the existing metal diaphragm valve DVE Series while realizing outstanding lightweight.
- Features a stainless steel diaphragm to realize outstanding airtightness and durability (also available in Ni-Co alloy diaphragm specifications).
- Valve open/close possible with approximately 90-degree rotation (Standard: round handle).
- Degrease cleansing treatment by precision cleaning of wetted parts.
- Clean-room assembly and packing.
- Optional specifications: Bottom-mount brackets and handles are also available
Specifications
Nominal Size | 1/4” | 3/8″&1/2″ |
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Working Pressure | Vac. ~1 MPa |
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Working Temperature Range | -10~+80°C |
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Cv Value (*1) | 0.3 | 0.7 |
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Connection Fittings(*2′ | VTF (Metal Gasket Seal Type Fittings) |
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BI-LOK (Double Pressure Ring) |
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(*1) VTF (male) connection. Varies according to connection and size.
(*2) Can also be used with other connections. Please contact our Sales Division.
Nominal Size | 1/4” | 3/8″ & 1/2″ |
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Weight (*,) | (Manual Valve) | (Manual Valve) |
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115g | 260g |
(Automatic Valve) | (Automatic Valve) |
235g | 475g |
Inner Volume (*3) | 1.3c | 4.9cc |
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Operation Durability’*4) | (Manual Valve | More than 100,000 times |
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(Automatic Valve1/4″) | More than 2.000.000 times |
(Automatic Valve3/8″, 1/2″) | More than 2,000.000 times |
(*3) VTF (male) connection: Value in valve-open state.
(*4) 1MPa: Our company’s test values in N2 gas insertion test.
Main Materials

| Part Name | Material |
1 | Body | SUS316L |
2 | Disk | PCTFE |
3 | Diaphragm | SUS631/Co-Ni Alloy |
4 | Diaphragm Retainer | SUS304 |
5 | Bonnet | SUS304 |
6 | Handle | Resin Treatment |
7 | Bonnet | SCS13A |
8 | Cover | A5056 |
Number Notation

Dimensions (Manual)
 |  | VTF (Male) (mm) | Model | Size | L | H | w | DVF-4VM | 1/4″ | 58 | 38.2 | 40 | DVF-8VM | 1/2″ | 76 | 41.3 | 40 |
|
|
 | VTF (Female) (mm) | Model | Size | L | H | w | DVF-4VF | 1/4″ | 70.6 | 38.2 | 40 | DVF-8VF | 1/2″ | 90 | 41.3 | 40 |
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|
 | BI-LOK (mm) | Model | Size | L | H | w | DVF-4D | 1/4″ | 64 | 38.2 | 40 | DVF-6D | 3/8″ | 77 | 41.3 | 40 | DVF-8D | 1/2″ | 82.6 | 41.3 | 40 |
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Dimensions (bracket)

Optional Specifications: with a Bracket (mm) |
Size | h | A | B | C |
1/4″ | 11 | 26 | 26 | 25.4 |
3/8″ | 16 | 34 | 32 | 28 |
1/2″ | 16 | 34 | 32 | 28 |