Find check valves including custom check valves, swing check valves, relief valves and more. From ball check valves to double check valves, you will find the check valve you need. Use the time-saving Request for Quote tool to submit your inquiry to all the check valve manufacturers and suppliers you select.
Check-All Valve manufactures check valves, stainless check valves, sanitary check valves, connector check valves and flange check valves. We specialize in precision-type check valves. We recognize that the customer is important and we will continue to serve each customer to the highest standards.
Milwaukee Valve has been an established industrial valve manufacturer since 1901, & our policy of quality & accuracy continues today. Manufacturing a large variety of pneumatic or electric check valves & swing check valves in cast iron, steel, brass & bronze with exacting demands for rugged conditions.
With 99% on-time shipping & custom bar coding services, Legend Valve offers some of the best check valves in the industry. Our gate valves, check valves, Y check valves, swing check valves & Y strainers come in brass, bronze or cast iron with 5-year warranties. Founder of the Green Mechanical Council.
Leading valve manufacturer & distributor Warren Alloy is a preferred supplier of master valves, wafer check valves, threaded check valves, globe valves, gate valves, fittings & more for oil, chemical, mining, pulp & paper industries. ISO 9001 certified with same-day shipping & hard-to-find specialties!
For factory-line control valves (manual or automated) and valves which far exceed industry standards, come to Cyclonic. Our combination ball & check valves & in-line check valves are custom manufactured almost entirely in-house & individually tested for above-standard reliability & longevity.
Check valves, also referred to as “non-return” or “one-way
directional” valves, are very simple devices that allow fluid,
air or gas to flow in only one direction. When the fluid moves in the
pre-determined direction, the check valves open. Any backflow is prevented
by the moveable portion of the valves. A swinging disc, ball, plunger
or poppet moves out of the way of the original flow. Since these devices
are slightly larger than the through hole, the pressure of backflow will
cause them to tightly seal, preventing reversal of flow. Gravity or a
spring assists in the closing of the check valves.
Check valves are indispensable. Domestically, check valves are found
in many devices such as faucets, toilets and dishwashers. Without check
valves, fresh water would be impossible and common plastics would be
unheard of. Industries use check valves to control flows of all types—from
the thinnest gas to radio active materials, from molten metal to highly
corrosive materials. Check valves can range in size from less than an
inch in diameter to 30 feet across. The simplest check valves can be
purchased at the local hardware store, but check valves may also be precision-designed
for highly sophisticated systems.
As aforementioned, check valves use different means of preventing backflow.
Swing disc check valves are typically used with liquids, such as slurries,
that can easily damage the valve seat. These check valves and custom
check valves may be installed either vertically or horizontally, but
a lever and counter-balance is recommended when vertically installing
swing disc valves. Ball
check valves use a ball with a small hole in the middle, which can
be either free-floating or spring-loaded. Custom check valves featuring
ball mechanisms have many uses in a wide variety of applications. Custom
check valves are more resistant to plugging than other check valves,
and thus can be used to handle even fluids that deposit gummy residue.
Check valves may also utilize a plunger, which is spring-loaded and usually
used to prevent backflow of pressurized gases, or backpressure. A poppet
in check valves is spring-loaded and typically installed in systems that
require prevention of backpressure.
The versatile custom check valve is often made of a wide variety of materials.
Some check valve manufacturers exclusively manufacture plastic check
valves. Other check valve manufacturers, check valve distributors, and
check valve suppliers provide brass check valves, electroless nickel
plated brass check valves and stainless steel check valves. The components
of check valves can be made of different materials, such as cast iron
check valves or bronze check valves, depending upon their application.
Many leading check valve manufacturers may also be construct their products
out of Teflon. Elastomer products can also be used to make check valves.
Check Valves and
Check Valve Manufacturers Images Provided by Check-All
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Types of Check Valves, Custom Check Valves, and Check Valve Manufacturers.
Ball
Check Valves are valves where liquids can flow
only one way. The pressure from the liquid forces the ball to move,
when the pressure from the fluid stops the ball also stops and the
valve closes.
Clapper Valves are a type of check valve used in
firefighting. This valve has a hinged gate (often with a spring pulling
it shut) that will only remain open in the outflowing direction.
Double
Check Valves consist of at least two independently
acting check-valves. They are typically used in liquid services.
Foot Valves are often used in conjunction with a
pump. The valve aids in pumping water and helps prevent backflow.
Hydraulic Check Valves prevent backflow in hydraulic
systems, typically using a ball or a poppet.
Lift Check Valves has a disc, sometimes called a
lift, that can be lifted up off its seat by higher pressure of inlet
or upstream flow. A guide keeps motion of the disc on a vertical line,
so the valve can later reseat properly.
Plastic Check Valves can be used for industrial
purposes or for lower grade home use, such as in a swimming pool or
aquarium. Typically, they are used when resistance to corrosion is
needed.
Pneumatic Check Valves allow fluids to flow in one
or two ways. When the fluid is allowed to flow more than one way it
is often metered.
Relief
Valves relieve excess and potentially dangerous
pressure from piping systems or closed-top vessels and are normally
closed until the set pressure is reached.
Sanitary Check Valves are used when the fluids contained
in the pipes need to remain germ free. These check valves are often
used for medical, food, or dairy purposes.
Silent Check Valves have a spring-operated return
mechanism. They eliminate the shock of sudden reversal of flow, making
them a favorite for use in clear liquid systems.
Stop Check Valves are a type of check valve with
override control to stop flow regardless of flow direction or pressure.
When the valve is open, it acts as a check valve, but the valve can
be deliberately shut to stop flow.
Swing
Check Valves use outside levers to slow down
the flow of materials through a pipe. The lever pulls the disk into
the flow which causes the flow to stop more quickly.
Wafer
Check Valves are often used for liquid services.
The check valve is made of two half-circle disks hinged together. With
positive flow, the two disks fold together to allow materials to flow
through the pipe. With reverse flow, they retract to a full circle
to restrict flow.
Terms related to Check Valves, Custom Check Valves, and Check Valve Manufacturers.
Actuator – A part of a regulating
check valve that
converts various forms of energy (electrical, fluid, etc.) into mechanical
motion to open or shut the check valve seats.
Backflow – A system’s reversal of normal flow resulting from
an increase in the downstream pressure exceeding that of the supply pressure.
Back Pressure –The pressure that is the result of a restriction
of the main flow, caused by gravity, pumps, or restrictions on the pipe;
measured in inches H20 or PSI.
Elastomer – A material often
used by top check valve manufacturers, in the production of custom check
valves which can be stretched or distorted but will
return to its original shape.
Extended Bonnet – Device used when the material running through
a pipe or a valve is at high or low temperatures. This device helps prevent
damage to the sealing materials within check valves.
Fluid Power –Power that is used to provide motion and force to
mechanisms by applying, generating, and controlling pumped or compressed
liquids or gases; this term also encompasses hydraulics and pneumatics.
Penstock Valve – A gate valve often found in waste water treatment
plants. It is used to contain fluids within check valves and custom
check valves.
Pilot Valve – A small valve which operates a larger
check valve with
very little power necessary for use; utilized when the system requires
the no-return characteristics of check valves for only a portion of the cycle.
Pneumatic – Operated or pressurized by air or other gases.
Pneumatic Actuator – A device that utilizes pneumatic energy to
regulate or open/close the check valve. A spring that is used solely to
open many custom check valves, will normally be fitted inside a valve which allows the valve
to return to the closed position.
Poppet – A valve that moves up to or from its seat perpendicularly
within check valves.
Positioner – Makes certain the closing device of
check valves stays
in the correct position.
Pressure Differential – Pressure difference in
check valves found between
the inlet and the outlet.
Pressure Spike – A quick pressure rise
common to many custom check valves.
PSI (Pounds Per Square Inch) – A unit of pressure; equivalent to
the metric unit of Kilonewtons per square centimeter.
Tank Valves – Check valves that are able to be inserted into the bottom
of tanks.
Valve Seats – A stationary part of
custom check valves which restrict fluid
or gas flow when it comes in contact with the movable portion of many
custom check
valves.