Where is the pressure reducing valve applied?

In water-pressure systems of industrial scale, such devices as control valves, typical pressure regulators, and other throttle valves are often used as pressure regulating devices. Regulators are different, some control the pressure after themselves, others - to themselves. The pressure reducing valve for water is considered to be a direct-acting regulator. He controls the pressure after himself, but on condition that this pressure is less than half of the input.

Characteristics of the mechanism

The pressure reducing valve is controlled by the liquid medium that flows through the working pipeline by moving the regulating device with the force resulting from a dynamic change in the monitored index.

Structurally, the reduction valve consists of three main elements: the regulating organ, i.e. Plates, a reference element, or a spring, and a reference element, which is a membrane.

The principle of the valve is the throttling of the liquid medium. Water comes from the high pressure cavity to the low pressure cavity, which is communicated by means of a gap between the seat and the valve disc. The sensitive element is usually soft rubber membranes with two fabric gaskets, but in some models it can be a piston with cuffs for sealing or rings made of a rubber-based material. As a locking mechanism, plates made of vulcanized rubber and metal alloy are used.

Valve Selection

Each pressure reducing valve is selected based on the Kvs value (throughput of pipeline valves). Among other technical characteristics of all pressure reducing valves, the maximum value of Kvs must be indicated to all standard sizes.

The pressure reduction valve is selected so that the required flow rate is between the minimum and maximum values. To select the optimum size, the products are checked against tables of known values of the throughput of the valves. However, for certain types of valves, the throughput capacity can not depend on the nominal diameter (as in the case of the size of DM505, DM510-518). It is highly discouraged to use reinforcement with a nominal diameter of two sizes smaller than the working diameter of the pipeline.

Pressure Reducing Valve Settings

The maximum accuracy of the output pressure setting range can be achieved by approximating the desired pressure setting level as close as possible to the upper range threshold. If the desired outlet pressure is, for example, 2.3 bar, then the range should be in the range of 0.8 to 2.5 bar, not the whole 2-5 bar. If it is necessary to use a wider range, special versions of the valve can be used.

Protection of the valve

It is known that the flow rate of water in the valve seat significantly exceeds the speed of its movement in the pipeline. And probably, the solid particles present in the water can damage not only the saddle itself, but also the plunger (the cylindrical rod). To protect the pressure relief valve, as a rule, a pre-filter is installed in front of it.

Types of valves

The following types of valves have become widespread: DM505, DM506, PRW25, KAT40, DM652, DM664, KAT30, RP45, DM604, DM613, DM810, DM814, DM815. They differ in terms of capacity, operating temperature, pressure settings, material used for manufacturing. Each consumer will be able to choose a suitable option for the cost and characteristics.