A valve is a mechanical device which is
used in various industries to regulate or stop the flow of a fluid .
It basically connects with the pressure holding vessels that
establishes the flow of fluid. There are three types of valves which
are used to connect with such vessels viz. Gate Valves, Check Valves
and Globe Valves.A specific type of Lined Valves is used for performing particular function like gate valves can completely stop the flow,
globe valve regulates the flow or can provide throttle flow and gate
valve is used to stop the back flow.
A Brief Detail About
Gate valves
As above said, a Gate valves is used
to stop the flow of liquid completely. This type of valve is designed
in such a way that it can handle thick or viscous fluid like oils,
grease, cream etc. Gate valve (which is classified under lined valve) works on the principle of on-off service therefore works on the principle of on-off
service therefore it is widely used in those systems where complete
shut-off is required and in which, use of valve is limited.
How Gate Valve Works?
A gate valve is constructed by using three components – Body,
Bonnet and Trim where Trim includes two functioning parts known as
Stem and Seat.
When a stem is switched to open the valve, the closure element called
“Disk” shifts from the path of the stream or flow of liquid and
fluid will flow smoothly without facing any resistance. But in case
of fully closed, a round disk will seal the contact surface which
provides complete obstruction in the path of stream and stops it from
flowing.
This gate valve must be used either in fully open or fully closed
condition to prevent it from damage. However, it can be used in
partially opened state to provide obstruction to the flow of fluid,
but it must be infrequent because in partial opened position the
liquid will flow in non-linear manner and cause vibration to the seat
and disk that further becomes the reason for leakage and damage.
Following is the classification chart :
Gate Valve is classified in
two ways – Parallel and Wedge-Shaped.
A Parallel Slide Valve does
not require any mechanical effort for getting closed rather it
accounts tightness by using line pressure. This eliminates the chance
of binding which usually occurs due to temperature fluctuation in the
valve. In Parallel Gate Valve, flat disc gate is placed between two
parallel seats to seal them.
Knife Valve: The
design of this valve contains the sharp edge at the bottom to cut the
solids or slurries.
Through-Conduit: This
valve consists of rectangular shaped element that closes the valve.
When this closure element is raised up then the valve is considered
as completely shut-off otherwise open.
A Wedge Gate Valve have
wedge shaped closure element which is used to seal both high and low
fluid pressure. It provides high seat tightness and hence, tight
shut-off.
Solid Wedge: This
type of valve has high strength and can be placed in any position. It
is widely used where turbulent flow is needed.
Flexible Wedge:
Flexible wedge shaped disk is used to correct the mismatch between
the seats. The strength of this valve is inversely proportional to
the cut around the perimeter of disc.
Split Wedge: Split
widget is popular for its self-adjusting and self-aligning
properties. This wedge sort comprises of two-piece disc which
situates between the tapered seats in the valve body.
What are the
Features of Gate Valves?
- Available in large sizes
- Can handle slurries and thick fluid
- Easy to assemble or remove
- Not so expensive
- Two-way valve
- Less resistance
- Huge capacity
- Efficient seals
Which
Material is Used for Constructing Gate Valve?
Raw Material plays
an important role in the valve construction so that it can work
properly and in a hassle free way. Since gate valves are used in
varied range of applications and these come in contact with different
kinds of liquid therefore, to prevent these from the failure,
suitable raw materials should be used for its designing and
fabrication. The choice of material mostly depends on the atmospheric
condition and media. Some common raw materials that are presently
being used for making gate valves are brass, bronze, gray iron, gamut
of steel types, and various alloys. Besides all these, in order to
choose suitable valve material there are some key points which must
be considered. These are:
- Temperature under which which it would be operated
- How much pressure it has to handle
- Availability of material and maintenance
- Compatibility of material with type of fluid
- Exposure to media
How to find Valves
Manufacturers and Suppliers Online?
It is very easy to find trusted
suppliers of different kinds of valve including gate valves online,
as there are many B2B portals which provide the information of the
regarding manufacturers. Each offers a wide range of quality valves
accompanied with a range of appreciable features, such as corrosion
resistance, durability, long term functionality and much more.
Buyers can avail quality Gate valves,
Plug Valves, Globe Valves, Check valves and other types of valves for
industrial use from reliable suppliers which are appropriate for
various requirements and can also be availed in customized technical
specifications.
