Low Pressure Diaphragm Valve

Low Pressure Diaphragm Valve
Details:
3 products corresponding to low pressure diaphragm valve: VDV1,VDV2,VDV8
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Description
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Model

 

0000s00021

VDV1

0000s00012

VDV2

0000s00034

VDV8

 

 

Low Pressure Diaphragm Valve VDV1

 

 

Introduction

 

• High pressure, high flow regulator

• Brass chrome plated body and bonnet for inert, reactive, flammable

and oxidizing oxidizing gas and mixtures up to grade 6.0

• Stainless steel 316L body for pharmaceutical, food and beverage application

• Simple outlet pressure limitation by handwheel

• Self-venting standard

• Stable outlet pressure

• Tested for use with oxygen

0000s00021

 

Application

 

• Component Testing

• Calibration Systems

• Laboratory Pressure Control

• High Pressure Sampling Systems

• Service & Test Equipment

 

Technical parameters

 

Type Diaphragm valve
Inlet pressure max. 60 bar
Materials
Body see ordering info
Seat PEEK
Diaphragm Elgiloy®
Filter SS316L
Inlet / outlet connection 1/4"NPT(F)
Temperature range -30℃ to +74℃
Leak rate 10^-8 mbar I/s He
Weight 0.5 kg

 

 

Low Pressure Diaphragm Valve VDV2

 

 

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

• Suitable for inlet pressure up to 60 bar, hand wheel design

• Wide range of inlets / outlets

• Metal-to-metal sealing to atmosphere

• Tested for use with oxygen

 

0000s00012

Application

 

• Component Testing

• Calibration Systems

• Laboratory Pressure Control

• High Pressure Sampling Systems

• Service & Test Equipment

 

Technical parameters

 

Type Diaphragm valve

0000s00003

Inlet pressure max. 60 bar
Materials
Body see ordering info
seat PEEK
Diaphragm Hastelloy® C276
Inlet / Outlet connection 1/4"NPT
Temperature range -30℃ to +74℃
Leak rate 1x10^-8 mbar I/s He
Weight 0.3kg

 

 

Low Pressure Diaphragm Valve VDV8

 

 

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

• Suitable for inlet pressure up to 40 bar

• 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

product-439-494

Inlet pressure max. 40 bar
Materials
Body see ordering info
seat

PEEK

Diaphragm Hastelloy® C276
Temperature range -30℃ to +74℃
Leak rate 1x10^-8 mbar I/s He
Weight 0.8kg

 

 

Simplified Explanation

 
What is it?

In simple terms: A "gentle gas switch" designed for low-pressure gas systems, where the diaphragm plays the role of a soft barrier to control gas flow. It's like a faucet for gas-slow and steady, but reliable, keeping things sealed tight without the need to fight high pressures.

Features:
  • Low Pressure Friendly: Typically designed for operating pressures up to 60 bar (about the pressure you'd find in a standard gas tank, much lower than high-pressure systems).
  • Seamless Seal: The diaphragm separates the gas flow without any moving parts coming into contact with the gas, making it perfect for high-purity and less aggressive gases (like nitrogen, oxygen, or CO2).
  • Flexible Operation: Available with either a handwheel (for fine flow control) or a lever (for quick shut-off), so you can control the gas flow exactly how you need it.

 

Analogy: It's like adjusting the water flow from a garden tap-gentle, controllable, and always reliable.

Where is Low Pressure Diaphragm Valve used?
  • Low-pressure gas systems: Managing gases like nitrogen or CO2 in cylinders or storage tanks with pressures around 60 bar.
  • Chemical processing: Regulating the flow of non-corrosive gases in pipelines where pressure is relatively low.
  • Laboratory setups: Precise control of gases (like oxygen or air) for experiments, ensuring purity without overcomplicating things.
  • Energy sector: Fuel lines for equipment or stations operating at low pressure (e.g., certain natural gas or biogas applications).
How to use it?

Two operation modes:

Handwheel version:

Suitable for: Applications where small, precise adjustments to flow or pressure are needed (like labs or medical systems).

Operation: Rotate the handwheel slowly, and the diaphragm moves gently to control gas flow, just like fine-tuning the faucet.

Lever version:

Suitable for: Applications requiring quick gas shut-off or frequently operated systems (like industrial processes).

Operation: Pull the lever 90°, and the diaphragm immediately opens or closes, giving you quick on/off control.

 

Installation Points:
  • Direction matters: The valve body will have an arrow showing the gas flow direction (→), so be sure to align it correctly when installing.
  • Interface matching: Ensure the thread type (e.g., G-thread, NPT) and size match your system, and use sealing tape if necessary.
  • Check the diaphragm regularly: Even at low pressure, diaphragms can wear over time, so follow the manufacturer's guidelines for maintenance and replacement.
Common Issues:

Issue 1: Valve doesn't seal properly (leaks)
Cause: Diaphragm wear or cracking, dirt in the valve seat, or damaged seals.
Solution: Replace the diaphragm, clean the valve seat, and inspect the seals.

 

Issue 2: Handwheel/lever hard to operate
Cause: Diaphragm sticking, lack of lubrication on moving parts, or build-up of pressure inside.
Solution: Release pressure before operating, lubricate the valve stem, and replace the diaphragm if needed.

 

Issue 3: Diaphragm failure
Cause: Overpressurization (more than 60 bar) or exposure to incompatible chemicals.
Solution: Ensure the system pressure doesn't exceed the rated 60 bar, and choose diaphragms made from resistant materials (e.g., PTFE or elastomers suited for specific gases).

 

Issue 4: Lever version not fully opening/closing
Cause: Incorrect installation angle or loose limit screws.
Solution: Adjust the valve orientation during installation and tighten any loose screws.

 

Summary in One Sentence

A low-pressure diaphragm valve is a "gentle gas switch" for controlling flows up to 60 bar. The handwheel allows precise adjustments, while the lever offers quick on/off action. Make sure to stay within the 60 bar limit for safe, reliable operation.
For selection, simply ask the manufacturer: "I need to control CO2 at 60 bar. Should I choose a handwheel or lever? And what diaphragm material is best for my application?"

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