Posted on Feb 10, 2020

Perez Plumbing, Inc.

There are three basic valve styles, the Stop Valve is one we will write about first. All three can be used for water, oil or airflow control if the casting has "WOG" stamped on it.

Stop Valve:

Stop valves use a rubber gasket to shut off water flow and must be installed in the correct direction to work properly. Stop valves are closed by screwing a rubber gasket down onto a seat in the middle of the valve. Pros only use small versions that act as shutoff valves for fixtures such as sinks and toilets and outdoor hose bibs. Flow is inefficient because of the circuitous route the fluid (water, in most cases) has to follow. It's important to orient the valve in the right direction with the arrow (cast into the side of the valve) aligned with flow direction. That way, water flows against the bottom of the rubber gasket. If the valve is put in backward, the flow will force the gasket away from the top of the valve.

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