Atmospheric vacuum breakers The purpose of a vacuum breaker is to stop back siphonage. The atmospheric vacuum breaker consists of a check valve member and an air vent that is normally closed when the ...

These normally closed valves permit flow between inlet and output ports when the pressure reaches preset levels, and can be fitted with free-flow checks to permit flow in the opposite direction.

It is a normally closed valve, designed to stop the flow of refrigerant when its coil is de-energized and allow full refrigerant flow when energized. On systems with a single evaporator and condensing ...

The two-way normally closed valve, built with a stainless-steel body, uses an integrated electrical coil enclosure and requires an 18-inch leaded connection.

This is a normally open valve but we’d suggest using a normally closed valve as a power outage will let the hose run continuously.

Ridge Seal Valve (RSV) – This electric motor actuated, normally closed valve features a patent-pending design that dramatically reduces internal leakage and provides high reliability for fluid ...

Based on function, on/off function held the larger share of the industrial valves market in 2022 Isolation valves can be in the normally open (NO) or normally closed (NC) positions.