The selection of special valves is an important factor for the correct use of special valves. In many cases, users will encounter various problems when using special valves, and often find that the specification and model are not selected properly. What should be paid attention to in the selection of special valves?
1、 Ensure longer service life
Continuous service life is a parameter that should be considered in most applications, especially in some applications, a longer continuous service life will be required. For example, in medical equipment and high running instruments, the equipment needs to operate continuously. Even if it is used for a long time, the number of equipment failures should be low or even zero. Regular maintenance and replacement of special valves should be avoided as far as possible. The longer service life also shows that the components have better reliability in complex and variable applications. In fact, it is difficult to guarantee the service life of high reliability. Whenever the valve works, the diaphragm will be pulled up by the push rod. After millions of reciprocating movements, the diaphragm will be worn when the push rod pulls up. This happens in most special valves. Some manufacturers solve this problem by changing the design of the push rod or diaphragm material.
2、 Ensure smaller design
Almost every improved instrument needs to be lighter and smaller than the original instrument, so every instrument design engineer needs to consider the size of each component when designing. In some precision or on-line monitoring equipment, it is particularly necessary to reduce the volume of components. The reduction of the volume of special valves can better accommodate circuit boards, containers, bottles and other non valve components. The compact valve body mechanism can also reduce the inconvenience of transportation.
As long as the component size becomes smaller, the design engineer can reserve more space for other structural design, and the equipment can also reserve more space for function expansion. For online monitoring instruments, there are certain regulations on the size. For example, alcohol testers need to be portable. On line total phosphorus and total nitrogen instruments contain many special valves and power devices. The size of special valves has become the main factor in the design and selection, freeing up the corresponding installation space for other components.
Traditional valves are generally larger than modern valves. Design engineers will find that the size and weight of each special valve are smaller, and it will have more advantages in the whole machine with limited installation space.
3、 Ensure that the traffic of the application is met
Increasing flow is an important parameter of special valves. However, the parameters affected by the change of flow velocity, such as energy consumption, pressure and flow velocity, are mutually restrictive. Experienced instrument design engineers know that even a slight increase in flow will affect various applications. For example, in order to speed up the speed of a single test item, it is necessary to remove the waste liquid discharge or cleaning liquid discharge as soon as possible within a few seconds, so as to save the time of occupying the common pressure source of the whole instrument. At this time, the pipe diameter larger than the test pipe is usually selected