CHK-4SV Check Valve

Ozone resistant stainless steel check valve using viton seal.  Simple check valve is rebuildable and extremely reliable.  Female NPT connections on inlet and outlet.

10 In Stock

Stainless Steel check valve with Viton seal. 

Spring-loaded check valve with 2.5 PSI crack pressure for positive seal, yet allows a high flow of ozone gas.  All stainless steel body with stainless steel spring and plunger.  Viton 0-ring used for sealing.



     -Working pressure = 1500 PSI

     -Working Temperature = -10 - 105-deg C

     -Crack pressure = 2.5 PSI

     -Threaded ends = Female NPT



     -Body = 316 Stainless Steel

     -O-Ring = Viton

     -Spring = 304 Stainless Steel

     -Cap = 316 Stainless Steel

     -Spool = 316 Stainless Steel

     -Snap Ring = 304 Stainless Steel

 Ozone resistant check valve

See image above

This check valve is completely serviceable and rebuildable.  The only sealing material is a Viton O-ring.  This O-ring is easily replaceable is ever necessary.  The body is one piece and requires no seal for the body.  Only the O-ring is a sealing surface.  This makes the CHK-SV check valve the most reliable check valve over the long term.




Part # Size Body Length Body Diameter Weight
CHK-4SV 1/4" 2.165" 0.75" 0.176 lbs
CHK-6SV 3/8" 2.165" 0.866" 0.22 lbs
CHK-8SV 1/2" 2.165" 1.063" 0.286 lbs
CHK-12SV 3/4" 2.677" 1.417" 0.638"
CHK-16SV 1" 3.268" 1.693" 1.056 lbs


Common Uses:

     -Ozone gas backflow prevention

     -Isolation of ozone from an oxygen concentrator

     -Prevention of water damage to an ozone generator

     -Direct use on Mazzei Venturi (see below)


We use this venturi directly on the Mazzei venturi.  The standard check valve supplied with a Mazzei venturi is made out of Kynar material and does not always create a leak-proof connection and may leak water slowly past the seal in many situations.  By removing the stock check valve and threading this check valve directly on the Mazzei venturi, a more secure connection is possible with stainless fittings, and a positive check valve with a positive seal is used.

Check valve used on venturi


Venturi Size
Gas Connection

Check Valve

3/4" Venturi 3/8" CHK-6SV
1" Venturi 3/4" CHK-12SV
1.5" Venturi 3/4" CHK-12SV
More Information
Manufacturer Oxidation Technologies
Quickbooks Stock Level 10.000000
Quickbooks Stock Date Expected 2024-06-02 00:00:00
Call For Price No
Max Pressure 1500 PSI
Operational Temperature Range -10 - 150-deg C
Material of construction Stainless Steel
Lead Time In Stock
Dimensions (LxWxH) See chart
Size 1/4"
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