Low Pressure Manual Stainless Steel Diaphragm Valve 1/4in 150psi for Nitrogen Oxygen Helium Systems
Low pressure manual diaphragm valve designed for precision gas control applications with nitrogen, oxygen, and helium systems. Features metal-to-metal sealing technology for reliable performance across vacuum to high pressure ranges.
- Metal-to-metal seal for leak-free service from vacuum to 150 psi
- Small internal volume for complete flow path purging
- Fully encapsulated valve seat for enhanced durability
- Nickel-cobalt alloy diaphragm for superior corrosion resistance
- Surface roughness options: Ra0.25μm (BA grade) or Ra0.13μm (EP grade)
- Helium leakage rate <1 × 10⁻⁹ std cm³/s
- Pneumatic actuators available with up to 3 million cycle life
| Component | Material |
|---|---|
| Handle | Aluminium |
| Actuators | Aluminium |
| Valve Stem | 304 Stainless Steel |
| Bonnet | S17400 Stainless Steel |
| Bonnet Nuts | 304 Stainless Steel |
| Buttons | 304 Stainless Steel |
| Diaphragm | Nickel-Cobalt Alloy |
| Valve Seat | PCTFE or PFA |
| Valve Body | 316L SS or 316L VAR/VIM-VAR |
| Parameter | Value |
|---|---|
| Port Size | 1/4", 3/8" |
| Flow Coefficient (Cv) | 0.27 |
| Inner Diameter | 0.16 in. (4.1 mm) |
| Maximum Working Pressure | 10 bar (150 psig) |
| Pneumatic Actuator Pressure | 4.2-6.2 bar (60-90 psig) |
| Operating Temperature | PCTFE: -23 to 65℃ (-10 to 150℉) PFA: -23 to 150℃ (-10 to 302℉) |
| Leakage Rate (Helium) | ≤1×10⁻⁹ mbar·l/s |
| Pressure Drop (bar/psig) | Air Flow (l/min) | Water Flow (l/min) |
|---|---|---|
| 0.68 (10) | 86 | 3.2 |
| 3.4 (50) | 230 | 7.2 |
| 6.8 (100) | 410 | 10.2 |
Standard (WK-BA): Welded joints cleaned according to standard specifications
Oxygen Service (WK-O2): Meets ASTM G93 Class C cleanliness requirements (add -O2 to order number)
Ultra High Purity (WK-EP): Electrolytically polished Ra 0.13μm surface finish, ultrasonically cleaned in deionized water (add -EP to order number)
| Basic Order Number | Port Type & Size | Dimensions (in./mm) |
|---|---|---|
| WV4-6L-TW4- | 1/4" Tube Butt Weld Fittings | A: 0.44 (11.2) B: 0.30 (7.6) C: 1.06 (26.9) L: 1.74 (44.2) |
| WV4-6L-TW6- | 3/8" Tube Butt Weld Fittings | A: 0.44 (11.2) B: 0.26 (6.6) C: 1.06 (26.9) L: 1.74 (44.2) |
| WV4-6L-FR4- | 1/4" Female Thread MCR Fitting | A: 0.44 (11.2) B: 0.86 (21.8) C: 1.06 (26.9) L: 2.78 (70.6) |
| WV4-6L-MR4- | 1/4" Integral Male MCR Fitting | A: 0.44 (11.2) B: 0.62 (15.7) C: 1.06 (26.9) L: 2.24 (57.0) |
All products undergo pre-production sampling and final inspection before shipment. Certified with CE certification for quality compliance.
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