Different Types of Valves used in Plumbing Gate valve

Valve is device that regulates, controls or directs the flow of a Gate valve is the most common type of valve in any
fluid by opening, closing, or partially obstructing fluid flow. process plant. It is a linear motion valve used to start or stop
Sound bit complicated? Ok, let me further simplified this.  A fluid flow. In service, these valves are either in fully open or fully
valve is a mechanical device that controls the flow and pressure closed position. Gate valves are used in almost all fluid services
of fluid within a system or Process.  So basically, it controls flow such as air, fuel gas, feedwater, steam, lube oil, hydrocarbon,
& pressure. and all most any services. Gate valve provides good shutoff.

Types of Valves Globe Valve

In piping following types of valves are used depending on Globe valve is used to stop, start, and regulate the fluid
the requirements. The cost of Valve in the piping system is up flow. Globe Valves are used in the systems where flow control
to 20 to 30% of the overall piping cost. And the cost of a given is required and leak tightness is also necessary. Globe valve
type and size of the valve can vary 100%. It means that if you provides better shut off as compared to gate valve and it is
choose ball valve over butterfly valve for the same function. It costlier than gate valve.
can cost you more. So, the selection of valves is essential to
Check Valve
the economics, as well as operation, of the process plants.
The check valve prevents backflow in the piping system.
 Gate Valve
The pressure of the fluid passing through a pipeline opens the
 Globe Valve valve, while any reversal of flow will close the valve.
 Check Valve Plug valve
 Plug valve
Plug valve is Quarter-turn rotary motion Valve that uses
 Ball Valve a tapered or cylindrical plug to stop or start the flow. The disk is
 Butterfly Valve in plug shape, which has a passage to pass the flow. Plug valve
used as on-off stop valves and capable of providing bubble tight
 Needle Valve
shutoff. Plug valve can be used in vacuum to high-pressure &
 Pinch Valve temperature applications
 Pressure Relief Valve Ball Valve
 Pressure Balanced Valve
A Ball valve is a quarter-turn rotary motion valve that
 Diaphragm Valve uses a ball-shaped disk to stop or start the flow. Most ball
 Zone Valve valves are of the quick-acting type, which requires a 90° turn of
 Locking Valve
the valve handle to operate the valve. The ball valve is Smaller
and lighter than a gate valve of same size and rating.
 Solenoid Valve
Butterfly Valve jurisdictions require pressure balanced valves in domestic
bathrooms and showers to prevent accidental scalding.
A Butterfly valve is a quarter-turn rotary motion valve,
that is used to stop, regulate, and start the flow. Butterfly valve Diaphragm Valve
has a short circular body. Butterfly Valve is suitable for large
valve applications due to Compact, lightweight design that A diaphragm valve is similar to a gate valve in that there
requires considerably less space, as compared to other valves. is a wheel or knob that moves an element in the valve fitting,
which limits the flow of water. In a diaphragm valve, the element
Needle Valve is a diaphragm that settles down over a saddle, thus stopping
water flow. The diagram below is a weir-type diaphragm valve,
Needle valves are similar to a globe valve in design with where water passes over a weir. There is also a straight-type
the biggest difference is the sharp needle like a disk. Needle diaphragm valve, which doesn't force water over a weir.
valves are designed to give very accurate control of flow in
small diameter piping systems. They get their name from their Diaphragm valves are generally used as shutoff or stop valves.
sharp-pointed conical disc and matching seat.
Zone Valve
Pinch Valve
Zone valves are used in hydronic heating and cooling
The pinch valve is also known as clamp valve. It is a systems to control the flow of water or steam. For instance, they
linear motion valve. Used to start, regulate, and stop fluid flow. may be provided in different rooms, different floors, or different
It uses a rubber tube, also known as a pinch tube and a pinch dwelling units so that each space can have local control over
mechanism to control the fluid. Pinch Valve is ideally suited for the heating or cooling. In most applications, zone valves are
the handling of slurries, liquids with large amounts of electrically controlled and are connected to a thermostat so that
suspended solids, and systems that convey solid material automatic control is achieved.
pneumatically.
Locking Valve
Pressure Relief Valve
Almost any type of valve can be locked to avoid
A pressure Relief valve or pressure safety valve are accidental or intentional opening or closing. However, valves
used to protect equipment or piping system during an with lever-type handles allow for more secure locking control.
overpressure event or in the event of vacuum. This valve Locking valves provide aligning holes that a lock can be passed
releases the pressure or vacuum at pre-defined set pressure. through to stop rotation of the handle. There are also locks
designed to be attached to non-locking valves to prevent
Pressure Balanced Valve adjustment.
Pressure balanced valves are used to maintain a Solenoid Valve
constant temperature of water in domestic showers or bathtubs.
A diaphragm within the valve allows the operator to set mixing Solenoid valves are electrically controlled valves that can
of hot and cold water; however in the event of a pressure drop offer precise on/off control via an automation system. Solenoid
of cold water (for instance, if a toilet nearby is flushed), the valves are used in buildings where an automation system
diaphragm will shift to limit an excessive flow of hot water. Many controls the plumbing or HVAC system. Another common use is
in irrigation systems where a computer controls the watering
times or the amount of water to be applied.