Buying Guide: In-Line Valves

In-line valves start and stop the flow of water, gas and other materials, regulate flow rates, prevent water from flowing the wrong direction, and much more. The Home Depot carries a wide selection of valves, pipes and fittings to complete your supply line system. If you're going to install or replace an in-line valve yourself, this guide will help you choose the right valve. 

Connections 
Valves are made from a variety of materials and can be connected to pipe lines in a number of ways.  Some thread on with male or female connections while others are soldered into place or connected with a compression fitting. Plastic valves are usually glued into place.

Types of Valves 
Each type of valve is designed to perform specific functions and is suited to certain applications.  Refer to this table to determine the type of valve you need.

Type	Applications	Points to Consider
Ball	Starting and stopping flow	Handle is attached to a ball with a small hole in the center that allows flow when turned May be manually turned, air actuated or controlled by an electric motor Provides a leak-proof seal Full-port ball valves offer unrestricted water flow Standard and reduced-port valves restrict water flow by one and two pipe sizes Easy to operate
Butterfly	Starting and stopping flow Regulating flow	Uses a circular vane or disc to stop the flow of fluid Requires just a quarter turn of handle to fully open or close Provides a tight seal to minimize leakage Ideal for throttling applications Not for use with corrosive or abrasive material flows
Check	Preventing backflow	Uses a disc or flapper that swings or springs closed to allow flow in only one direction Operates automatically based on flow
Gate	Starting and stopping flow	Features a gate-like wedge that fits against the seat Opens and closes with a hand wheel Use for supply lines that are in constant use Not suitable for regulating flow volume
Globe	Regulating flow	Shuts off the flow with a rounded disc Opens and closes with a hand wheel Ideal for throttling applications and frequent use Not recommended where full, unobstructed flow is required Configurations include straight flow, angle flowand cross flow
Regulating	Reducing pressure in a line	Reduces high inlet pressure to a lower outlet pressure Keeps water pressure for home and irrigation systems at a constant level

Other Types of Valves 

Automated Valve Systems 
Pneumatic and electric valve systems make it easy to close hard-to-reach valves. Pneumatic systems are more economical and close valves very quickly while electric valve systems offer convenient motor power.

Saddle Valves 
Saddle valves are an ideal solution where low volume and low pressure are required, such as for icemakers, humidifiers or hot water dispensers.

Stop and Waste Valves 
These valves include an auxiliary opening on the side, for draining after the water has been shut off.