Types of valves

Design and function

To find out what type of reinforcement is better to choose, you need to know its main benefits and operation.The cost of design and dimensions depend on the diameter of the tubes, and the material from which made the latch.

latches consist of any type of body and lid which form the space (work area) in which the bolt is placed.In case the two ends are arranged, to which the item is connected to the conduit.These elements may be the coupling, screw, as well as for welding.Hull construction contains projections called saddles.When closing the valve sealing of the shutter pressed onto the seat by not allowing the liquid to overcome the work area.

element that facilitates the movement of the shutter, is called the spindle.spindle moving mechanism for the threaded nut is:

• manual
• automated (using actuator).

for large-diameter pipes are used exclusively gate with an electric motor.This provides additional safety locking system.

Types of valves for water pipes

V

They carry out the termination of liquid flow via gate - conical disc, adjacent to the two seats, angled.Upon actuation of the spindle of the flywheel moves the disc rotates in the nut thread.Snug fit to drive the housing projections is due to its wedge shape and the sealing surfaces of the gate.This and similar types of valves used for pipelines transporting water, ammonia, steam, gas, oil and other substances.

Species wedges and their features:

• hard wedge - has a high integrity that somewhat complicates the conditions of maintenance and operation of the valve;
• double disk wedge - complicated design improves resistance to wear of the sealing surfaces, improves sealing and reduces the effort needed to open or close the valve;
• elastic wedge - modified and simplified device makes it possible to work effectively over a wide temperature range, offset housing deformation caused by stresses on the pipe.

Parallel

Such catches your device are substantially different from the above.Shutter therein consists of two discs connected by spacer spring or wedge.With the introduction of valve position "closed" wheels are pressed against the saddle and stop the flow of traffic.The main advantage of the parallel shut-off valves is its high reliability: the valve overlap almost perfectly the stream and therefore can operate in any temperature regime.

Mounting valves for plumbing

There are different ways valve connection pipes: flanged, threaded, socket connection, and welded.The latter is the most reliable and convenient.Also certain types of valves have a tendency to be fixed on the pipes without a separate connecting elements.

When installing shut-off valves should be remembered that the valves are set up exclusively flywheels in order to avoid leakage of hydraulic fluid or gas leaks.So it is necessary to ensure that the flange connection (if any) performed smoothly and without distortions.

The widespread use of valves in water supply systems due to the fact that they have a simple structure, small construction length and easy to operate.Due to the peculiarities of the structure, they are used in a variety of conditions, as well as have small hydraulic resistance, which allows them to operate at high speeds of the transported medium.