Introduction

If the back-pressure exerted on the milliGAT pump exceeds the maximum that can be tolerated by the internal springs, the rotor of the pump will move away from the stator and fluid will leak into the internals of the pump and then out of the leak port. This can lead to corrosion or damage to the seals. A safe way to prevent this from happening is to install a pressure relief valve such as that depicted in the picture above.

The regulator in this valve is designed to stay shut until the pressure exerted on it exceeds its rating (typically 40 psi - Blue or 100 psi - Red cartridge). At that point, fluid takes the alternative path through the pressure relief valve. The exit from the valve can be plumbed to waste. In this way, the pressure capabilities of the pump (rated at 100 psi) will never be exceeded.

Installation

The pressure relief valve should be installed close to the outlet of the pump by cutting the tubing and using the provided miniature 6-40 fittings to make the connection. The exit port is a ¼-28 female port and a male 3/8" thread on the exit port allows for convenient bulkhead mounting.

Wetted Materials

The back pressure relief valve holder is manufactured from PEEK. The pressure cartridge, the component that maintains the desired pressure is manufactured from PEEK and Tefzel with internal components that include highly fluorinated polymers and gold plated stainless steel.