Degassing Valve for Corrosive & Ultra-pure Liquids • Series DGV

US Patent #7,481,238 B2

Purpose of a Degassing Valve…

Imagine having an employee who continuously opens a valve to release air or gas whenever it builds up in a piping system.

But a Degassing Valve Won't Get a Sore Wrist…

…and it doesn’t take a lunch break. It also closes as soon as the air or gas is expelled.

Uses for a Degassing Valve

1. Systems with Sodium Hypochlorite, Hydrochloric Acid, Water…any liquid prone to outgassing.

2. Ozone and other gas generating processes.

3. Virtually any piping system in which air enters via pumps and fittings.

How it Works:

The Plast-O-Matic Series DGV Degassing Valve connects to a 1/2" tee on high points in the piping system.

It is normally-open; air flows in and out freely prior to system start-up, pressurization & liquid flow.

As liquid flows into the valve,

Air is forced through the orifice and expelled through a 1/8” outlet.

A natural polypropylene float rises with the liquid, and begins to pivot an arm. A seal on the arm then begins to close against the orifice.

FLOAT

ARM

Once liquid rises and has forced most of the air out of the valve,

The float rises completely, which completes the pivoting of the arm.

The seal on the end of the arm is now fully sealed against the orifice, and the valve is closed.

But while the system is operating, it may be outgassing, drawing air, or both. The resulting gas will generally be forced to the highest points in the piping system…right where the Degassing Valve has been installed.

Gas will now begin to accumulate above the float…

When enough air or gas accumulates in the valve to displace the liquid, the float naturally begins to drop with the liquid level…

the Degassing Valve re-opens, and the accumulated gas is once again expelled from the system

After the air or gas is expelled, the float rises, lifting the arm and the valve is re-sealed.

The key to the Series DGV Degassing Valve…

…is that the valve opens and closes over and over and over, automatically expelling gas as it accumulates!

• Series DGV emits trace amounts of gas as it occurs.

Know the Difference between a DEGASSING VALVE and an

AIR RELEASE VALVE...

• To expel a massive volume of air, such as at system start-up, Series ARV Air Release Valve should be used.

• It should be placed at the highest point – or points – on the piping system.

• Series DGV must be installed vertically.

• Small amounts of liquid and/or vapors may be emitted from the top vent. In applications where these may be harmful, the vent should be piped to a scrubber or other safe location.

Installing the Degassing Valve...

Advantages of Series DGV…• No internal or external metal parts – complete protection against corrosion and impurities!

• Max operating pressure 100 psi.

• PVC or CPVC body, natural polypropylene float.

• EPDM or FKM (Viton) seals.

Advantages, continued…

• Piping convenience – ½” NPT process connection, 1/8” NPT vent connection.

• Each valve is individually tested prior to shipment.

• First continuous venting all-thermoplastic valve!

Series DGV • Degassing ValveUS Patent #7,481,238 B2