How to choose the control valve yourself

Practically all transportation processes related to the transfer of substances in various aggregate states (gas, liquid) must be constantly monitored and adjusted. Periodically, even the flow of substances needs to be regulated. To solve this problem, you will have to use a special control valve installed on the main line.

Technical parameters of control valves

The control valve can be described by several important technical and operational characteristics. Depending on their size, a specific device is selected.

Let's list the main parameters:

• the maximum pressure that can be in the pipeline (measured in megapascals, MPa);
• Standard operating temperature (measured in degrees Celsius);
• throughput capacity (measured in m3/h and denoted by the letters Kvy);
• permissible working medium transported by pipeline.

The main types of control valves: the difference between KPSR and KZR

From the name it is clear that the control valves are divided into two main types – through seat control valves (KPSR) and shut-off control valves (KZR). Both devices are identical to each other in price, appearance and functionality, but still differ in internal structural elements:

• The main difference between KPSR and KZR is the presence of an unloaded structure on the gate part of the device. With its help, the flow of the working medium is quickly and reliably blocked. Such an element is characterized by high safety and allows you to save electrical energy. You can block the product without resorting to special efforts. You will not need an executive mechanism for this. The principle of operation resembles an automatic wedge valve with an electric drive.
• The second characteristic feature of the CPSR is the maximum allowable leakage at the gate is 0.05%. For comparison, the KZR has this indicator equal to 0.1%, which is twice as bad. And again, the KPSR valve shows itself better than the KZR, therefore it is even safer when operating the pipeline. The remaining differences between the CPSR and the KZR are mostly related to manufacturers.

Thus, it is much more efficient and safer to operate a CPSR instead of a KZR, since the first device is more technologically advanced, modern and economical. In addition, the cost of the CPSR is approximately identical to the price of the KZR, so even from this point of view it makes no sense to buy a shut-off valve.