Water shut-off valves (30h6Br)

To timely shut off the flow of water requires a modern water supply shut-off valve, among which are cast iron and steel latches, swing flaps and check valves. The cast iron valve of the name 30ч6бр is perfectly combined with a hydraulic drive, the electric drive and a flywheel, and to the pipeline it is mounted by means of flange connection. Such a valve is indispensable for pipelines through which steam and water, oil or oil move, but the transported gaseous or liquid medium must remain neutral with respect to all parts that are in contact with it.

Cast iron valve 30ч6бр can be used as a reliable shut-off device that blocks the flow of water. Its body is made of strong cast iron, and brass is used to make the spindle seal. Such a valve is capable of withstanding the medium passing through it, if the temperature of the transported vapor or water does not exceed 225 degrees. As a water shut-off valve steel wedge valves of the brand 30с41нж are also used - these are cast parts equipped with a sliding spindle.

Such stop valves are used on pipelines, through which liquid non-aggressive petroleum products, oil and oil, steam and water move, as well as other gaseous and liquid media. The main advantages of steel wedge gate valves are in the flanged connection to the pipeline and the highest class of tightness, and the temperature of the transported working medium can reach 450 degrees. The spindle and discs of the brand 30с41нж are manufactured from steel, the working surface of the casing is supplied with stainless welded wire, and the control is manual.

The butterfly valve or butterfly valve is a control or shut-off device intended for installation on a pipeline. The locking member is in the form of a disk and can be rotated about an axis at an angle to the transported stream or perpendicular thereto. The rotary disk shutter is used for non-corrosive media, petrochemicals and steam, heating and water supply, and is equipped with pneumatic, electric or manual drive. Reliable valves like "Butterfly" were developed specifically for throttling or shutting off the flow, which moves through pipelines.

On the pipeline they are mounted between the standard return flanges, and additional seals are not used, as the lining of the valve body acts as such seals. To center the Butterfly flap between the flanges located on its body, special tides with holes are made, and through them pins or tightening bolts are passed. The Butterfly valve body is made of cast iron, the handle and stem are made of steel, and the disk is made of malleable cast iron with a stainless steel coating. Among the advantages are small installation lengths, simplicity and reliability of operation and installation, and the flow rate can be adjusted.

The wafer type check valve is one type of safety self-resetting device that prevents the return flow in the pipeline. Such valves are called reverse shut-off valves, and their advantages are a long service life, low head losses, easy installation, compactness. Their body is made of gray cast iron, a bolt with an eyelet and a bushing of carbon steel, a rod and a spring are made of stainless steel.

Latches 30ч6бр are supplied with sealing brass rings which ввальцовываются in disks and the case. The medium supply direction and operating position can be any, and the shutter opens or closes completely. The rotation of the threaded sleeve is caused by the rotation of the flywheel, and the rotational motion is transformed into the translational movement of the used spindle. The spindle loaded with discs is first lowered, then the discs are moved apart with the wedge, and the valve itself closes. Between the sturdy body and the lid is mounted a paronit cushion, and between the sturdy spindle and the lid there is a padding, which is fixed with anchor bolts.

Instead of a stuffing box , an asbestos cord is used, which is impregnated with graphite grease. Cast iron latches are considered a kind of gate having several operative positions, and they must correspond to the operating environment. Thus, the transport medium should not exceed the permissible temperature regime, and remain compatible with the material from which the pipeline and its component parts are made. Gray iron and brass are used for manufacturing the valve, the most important parts are made of cast iron, and brass is used to create seals on the body and discs.