Model
|
VDV30 |
VDV31 |
High pressure diaphragm valve VDV30
Introduction
• Diaphragm valve
• Brass chrome plated body for inert, reactive, flammable
and oxidizing gas and mixtures up to grade 6.0
• Stainless steel 316L body for corrosive gases
• Inlet pressure max. 300 bar
• Left or Right lever direction for shutoff
• Wide range of inlets / outlets
• Metal-to-metal sealing to atmosphere
• Tested for use with oxygen
Application
• Component Testing
• Calibration Systems
• Laboratory Pressure Control
• High Pressure Sampling Systems
• Service & Test Equipment
Technical parameters
| Type | Diaphragm valve |
|
| Inlet pressure | max. 300 bar | |
| Materials | ||
| Body | see ordering info | |
| seat | PEEK | |
| Diaphragm | Hastelloy® C276 | |
| Inlet / Outlet connection | 1/4"NPT F | |
| Temperature range | -30℃ to +74℃ | |
| Leak rate | 1x10^-8 mbar I/s He | |
| Weight | 0.5kg | |
Product picture
High pressure diaphragm valve VDV31
Introduction
• Diaphragm valve
• Stainless steel 316L body for corrosive gases
• Inlet pressure max. 300 bar
• Left or Right lever direction for shutoff
• Wide range of inlets / outlets
• Metal-to-metal sealing to atmosphere
Application
• Component Testing
• Calibration Systems
• Laboratory Pressure Control
• High Pressure Sampling Systems
• Service & Test Equipment
Technical parameters
| Type |
Diaphragm valve |
|
| Inlet pressure | max. 300 bar (60 bar option) | |
|
Materials |
||
| Body | see ordering info | |
| seat | PEEK | |
| Diaphragm | Hastelloy® C276 | |
| Temperature range | -30℃ to +74℃ | |
| Leak rate | 1x10^-8 mbar I/s He | |
| Weight | 0.2kg | |
High Pressure Diaphragm Valve Simplified Explanation
In simple terms: A "seal switch" designed specifically for high-pressure gases, with an elastic diaphragm at its core to separate the gas flow, controlling the gas "on/off" like pinching a water pipe. It can withstand high pressure and prevent leaks.
- High Pressure Resistance: Maximum working pressure of 300 bar (equivalent to the water pressure at a depth of 3000 meters).
- Impenetrable Seal: The diaphragm physically separates the gas flow, with the valve stem not coming into contact with the medium, making it suitable for high-purity and corrosive gases (like chlorine and hydrogen).
- Flexible Operation: Available in handwheel (fine adjustment) or lever (quick switch) versions, akin to the difference between turning a faucet and using a wrench.
Analogy: Like the "safety valve" on a pressure cooker, but with manual control for the switch and a tighter seal.
- High-pressure gas cylinder management: Switching gases like hydrogen and nitrogen in tanks with pressures of 300 bar.
- Chemical pipelines: Controlling the flow of corrosive gases (e.g., sulfuric acid vapor, chlorine).
- Laboratory systems: Precise control of high-purity gases (like helium and argon) to prevent contamination.
- Energy industry: High-pressure pipelines in natural gas fueling stations and hydrogen fuel cell systems.
Two operation modes:
1)Handwheel version:
Suitable for: Scenarios needing fine adjustment of flow or pressure (like in labs or precision instruments).
Operation: Rotate the handwheel, and the diaphragm moves slowly up and down, controlling gas flow gently.
2)Lever version:
Suitable for: Scenarios needing fast switches or frequent operation (like on industrial production lines).
Operation: Pull the lever 90°, and the diaphragm opens or closes instantly, allowing for "immediate on/off" of gas flow.
- Direction matters: The valve body will have an arrow indicating the gas flow direction (→), which must match the flow direction during installation.
- Interface matching: Ensure the thread type (e.g., G-thread, NPT) and size are compatible. Use sealing tape if needed.
- Check the diaphragm regularly: Diaphragms are prone to wear under high pressure, so follow the manufacturer's recommended replacement schedule.
Issue 1: The high pressure diaphragm valve does not seal properly (leaks)
Cause: Diaphragm aging or cracking, impurities on the valve seat, or worn sealing rings.
Solution: Replace the diaphragm, clean the valve seat, and check the sealing rings.
Issue 2: Difficulty operating the handwheel/lever
Cause: Deformation of the diaphragm, lack of lubrication on the valve stem, or internal pressure not released.
Solution: Release pressure before operation, lubricate the valve stem with high-pressure grease, and replace the deformed diaphragm.
Issue 3: Frequent diaphragm failure
Cause: Overpressure use (above 300 bar) or corrosive mediums damaging the diaphragm (e.g., fluorine gas eroding rubber diaphragms).
Solution: Choose a model with a higher pressure rating, or switch to a corrosion-resistant material (e.g., PTFE diaphragms).
Issue 4: Lever version not fully opening or closing
Cause: Misalignment during installation or loose limit screws.
Solution: Realign the valve installation direction and tighten the limit screws.
A high-pressure diaphragm valve is a "high-pressure switch for gas." The handwheel allows fine adjustment, while the lever provides quick on/off action. Ensure you don't exceed 300 bar pressure.
For selection, just ask the manufacturer: "I need to control chlorine gas at 300 bar. Should I choose a handwheel or lever? And what diaphragm material should I use?"
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