Check valves

Catalog

The main purpose of check valves is to create optimal conditions for the movement of liquids or gases in a given direction (it is indicated by an arrow on the body). In case of backflow, the device prevents it in automatic mode. Thanks to the check valve, the service life of industrial and household equipment, pumps, main lines is significantly extended in the mode of constant changes in the parameters of the technological process. As a rule, conditions for changing the direction of movement of the working environment are created at the time of switching on or off the installations, as well as in case of emergency situations.

Specifications

The undoubted advantages of check valves include the following characteristics:

Convenience of carrying out repair and installation activities.
The possibility of placement on horizontal trunk lines (the cover of the device should be on top).
Versatility. The valves are presented in several varieties according to the material of manufacture, which makes it possible to use them in various climatic and industrial conditions. Fittings of this type are equipped with communications with liquid and gaseous working media (including aggressive ones).
The use of sealed housing walls ensures the operability of products in a wide temperature spectrum.
The possibility of manufacturing a check valve according to an individual drawing (as a rule, we are talking about using welded flanges of certain sections).
High rates of tightness of the gate, due to the presence of special spool valves in the structure.

Indicator	Meaning	Note
Appointment	To prevent the backflow of the medium in the pipeline
Standard for manufacturing	TU 3742-002-71634056-2010
Type of reinforcement	Reverse
Type of reinforcement	RTCO check valve	RTCO10
Sealing class of the shutter	class "A, B, C, D" according to GOST 9544 depending on PN
Conducted environment	Water, steam, oil, liquid and gaseous petroleum products, water-gas-oil mixtures, natural and associated gas, including those containing hydrogen sulfide, other media in relation to which the material of the valve parts is corrosion-resistant	Specified when ordering. For corrosive media, the concentration of active substances is indicated.
Temperature of the conducted medium	from minus 60 ° C to 560 °C, depends on the material of the valve parts	Specified when ordering, In the absence of requirements, it is delivered according to the technical documentation of RTMT LLC
Climatic design and accommodation category	U1, HL1, UHL1, T1 GOST 15150. Other types of climatic versions and accommodation categories are allowed.	Specified when ordering
Category of earthquake resistance	non-earthquake-resistant design with (up to 6 points inclusive on the MSK-64 scale); earthquake-resistant design With (over 6 to 9 points inclusive); – performance of increased seismic resistance of the PS (over 9 to 10 points inclusive).	Specified when ordering. In the absence of a requirement, it is supplied in a non-seismic (C0) version
Type of management	Automatic under the influence of the conducted environment
Connection to the pipeline	- coupling (G, Rc, K); - flanged according to GOST 33259 versions A, B, C, D, E, F, J, K, L, M; - flanged with mating flanges; - for welding into the joint; - coupling for welding.	Specified when ordering. For coupling valves, the size of the connecting thread is indicated, for flanged valves, the flange design is indicated. For versions for welding and counter flanges, it is possible to perform cutting for a specific pipe. In the absence of requirements for the execution of flanges or cutting for a specific pipe, it is supplied according to the technical documentation of RTMT LLC
Type of coating	Factory anti-corrosion coating, coating for ground installation, coating for underground installation according to special requirements	Specified when ordering. In the absence of a requirement, it is supplied with a factory anti-corrosion coating
Average service life	20 years

Check valves are reliable direct-acting protective valves that minimize the likelihood of backflow formation in communications for various purposes. These autonomous devices are widely used to control networks that need strict compliance with one-way movement of the working environment to create a closed circulation.

Design features

The check valve is designed for operation on gas and water mains. Specialized machines are used for the production of mechanical valves. High-quality steel of proven brands is used as the manufacturing material.

20X13

09G2S

Structural, carbon steel. The material is not prone to release fragility, its specific gravity is 7.85 g / cm3. The operating temperature is up to +450 degrees Celsius. The housing, cover, and flange are made of this steel grade.

Heat-resistant, corrosion-resistant steel. It is resistant to prolonged exposure to temperatures up to 500 ° C.

The rod and saddle are made of steel grade.

Structural, low-alloy steel. It is resistant to loads, prolonged exposure to temperatures up to +425 degrees Celsius. A flange, housing, and lid are made of it.

Where are they used

The check valve is a universal valve that protects the equipment from the impact of other pressure communications from the working environment. The main part of the device is the shutter. In the heating circuits, the product does not allow the coolant to move in the opposite direction, hermetically blocking the working flow.

Situations where there is a possibility of water moving in a different direction arise when the pumping equipment breaks down. Especially for such cases, rotary and lifting shut-off valves have been developed. It minimizes the likelihood of accidents due to a decrease in pressure in a certain sector. Classification of check valves is carried out according to the material of manufacture and technical characteristics.

The principle of operation

To control the movement of the working medium, a special spool is installed inside the valve: it moves vertically (up or down). The impact of a liquid or gas provokes the lifting of the spool: as a result, the passage opens in a given direction. Upon completion of the flow movement, the spool is lowered onto the saddle, eliminating the possibility of a reverse stroke. The check valve refers to fully automated devices. During installation activities, it is important to observe the correctness of the main direction of the medium: for this there is an arrow on the valve body.

Varieties

Devices of this type are represented on the modern market by a significant number of options. Check valves from the company "RTMT" are characterized by simplicity of design, high strength of the metal body and the working spool.

Classification criteria for check valves:

inner hole size (15-25 mm);
the direction of movement of the working medium (through and corner);
installation method (coupling, flange, welding);
a type of spool (in the form of a ball, disk, with two flaps);
locking method (gravity, spring).

To place an order for the purchase of the necessary modification of the check valve, call us by phone feedback or write to info@rtmt.ru .

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