Important Safety Information
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![](https://www.pmsinstrument.com/wp-content/uploads/20200130_153550-1024x576.jpg)
The Safety Valve is located under the Lid on the far side of the chamber.
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_153646-1024x576.jpg)
Remove the Compression Gland Lid to access the Safety Valve.
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_153659-1024x576.jpg)
Turn the Safety Valve cap counter-clockwise using a 5/8 Inch wrench.
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_153713-1024x576.jpg)
Unscrew and remove the Safety Valve cap.
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_153720-1024x576.jpg)
Lift the Safety Valve Piston out of the Safety Valve body.
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_153736-1024x576.jpg)
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_154946-1024x576.jpg)
Wipe the Piston clean.
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_154010-576x1024.jpg)
Use a cotton swab to clean inside the Safety Valve body. A common cleanser can help with this process.
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_154033-576x1024.jpg)
Use compressed air to blow out any remaining dirt.
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_154157-1024x576.jpg)
Lubricate the 006 O-Ring lightly with Petroleum Jelly.
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_154233-1-576x1024.jpg)
Insert the Piston back into the Safety Valve body.
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_154245-576x1024.jpg)
Place Safety Valve Cap over the Piston and thread on finger-tight.
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_153659-1-1024x576.jpg)
Use the 5/8 Inch wrench to gently snug the Cap into place.
DO NOT OVER-TIGHTEN.
To ensure that the Safety Valve is working properly, pressurize the instrument and test the Safety Valve. You can see a tutorial on that process here.
If the valve is leaking or not activating properly, you might need to change the Piston O-Ring.
![](https://www.pmsinstrument.com/wp-content/uploads/20200130_153937-1024x576.jpg)
Use a metal probe to remove the O-Ring. Replace with a Size – 006 O-Ring. This should be a Buna-70 hardness. Ensure there is not debris in the O-Ring track. Reinstall and test.