Clearing the Confusion Over Vented Regulators

Understanding when to use a vented regulator can be difficult.

Regulators are complex devices that can perform a number of different functions in a fluid system that are often crucial to facility operations and safety. Vented regulators increase accuracy, safety and overall performance over non-vented regulators under certain operating conditions and applications. Here we will clarify this important feature so you can make the best decision for your system.

With a non-self-venting regulator, you cannot reduce the downstream pressure if a valve is closed downstream. Venting the system using a purge valve will be necessary for the gauge to display the new set-pressure.

The purpose of a self-venting regulator is for when flow stops. The downstream pressure needs to be relieved, and rather than place a relief valve downstream, the customer can opt for a venting regulator and eliminate the need for a valve. The downside is that an o-ring has been added so you will have to deal with potential issues like material compatibility.

In critical applications, if the diaphragm were to fail, then it may release toxic gas to atmosphere. This captured vent will allow for a safe way to prevent this from occurring. The captured vent is for particular applications, but it is generally more in demand than the self venting.

In those critical applications where you want to incorporate the benefits of downstream pressure relief and the safety of the captured vent port, the self vent with captured vent may be the best option. The two piece cap design allows for alignment of the vent port as you may want that to vent safely away from an operator.

Questions on vented regulators? Email or call 866.901.0151.