Solenoid valve Some features and elements of knowledge
(1) leakage blocking must, easy to control leakage, the use of safety. Internal and external leaks are endangering the safety factor. Other automatic control valve will usually stem out from the electric, pneumatic, hydraulic actuator control spool rotation or movement. This should solve the long-term action of external dynamic seal valve stem leakage problem; only the solenoid valve is sealed with a magnetic force on the electric control valve separated from the magnetic core within the casing to complete, there is no dynamic seal, so easy to block leakage must . Electric torque control valve is not easy, prone to leakage, or even pull off the stem head; solenoid valve within the structure type is easy to control the leak, until reduced to zero. Therefore, the use of special safety valve, especially for corrosive, toxic or high temperature media.
(2) The system is simple, they take the computer, low price and modest. Solenoid valve itself is simple, the price is also low, compared to other types of valve actuators easy installation and maintenance. More significant is the composition of the automatic control system is much simpler, much lower price. As the solenoid valve is switching signal control, and industrial computer connection is very convenient. In today's widespread use of computers, the era of decline in prices, the solenoid valve on the more obvious advantages.
(3) action express, power tiny, lightweight form factor. Valve response time can be as short as a few milliseconds, even if the pilot solenoid valve can be controlled within tens of milliseconds. As the self into a loop, other than the automatic control valve more responsive. A properly designed solenoid valve coil power consumption is very low, is energy-saving products; can be just the trigger action, automatically maintain valve position, usually is not power. Small size solenoid valve, saving space and light and beautiful.
(4) regulation accuracy is limited, for media is limited. Solenoid valve is usually only switch two states, the spool only in two extreme positions, not continuously adjustable, (trying to break a lot of new ideas, but are in the pilot trial phase) so the adjustment accuracy is also subject to certain restrictions.
Solenoid valve on the media have a high cleanliness requirements, including granular media can not be applied, the case must first filter out impurities. In addition, the viscous medium can not be applied, and that particular product is suitable for medium viscosity range is relatively narrow.
(5) model and diverse, and versatile. Although the inherent electromagnetic valve, the advantages are still very prominent, so we designed a variety of products to meet different needs, extremely versatile. Solenoid valve technology advances are centered on how to overcome the deficiencies, how to better play to existing strengths and expand.
First, the product selected points
1 solenoid valve control parameters for the selection of the main path, the design nominal pressure, medium temperature range allowed, interface size and so on.
2 solenoid valve with solenoid valve opening and closing drive, usually less than 40mm in diameter for the two control, especially for multi-turn, cut or convert gas, liquid Road.
3 valve sealing performance is the assessment of valve pros and cons of the key indicators of quality. Valve sealing performance includes two aspects, namely, leakage and leakage. Leakage is between the seat and shut down parts of the media to achieve the sealing. Stem packing leakage is part of the disclosure, the disclosure of the mouth parts of the gasket and the valve body casting defects caused due to leakage. Leakage is allowed to happen.
4 solenoid valve main advantage is small size, reliability, easy maintenance, low price. Selected according to process requirements need to pay attention to normally open or normally closed.
Second, the construction and installation points
1 valve installation position, height must meet the design requirements in line with the direction of the mouth, the connection should close firmly.
(2) the appearance of the valve must be checked before installation, the valve plate should be consistent with current national standards GB12220 "Universal Valve logo" requirement.