Have a question about on-off valves?

1. The choice of drive method for on-off valves (electrical or pneumatic) usually depends on the local energy supply conditions and control requirements. If a reliable power supply is available on-site, electric valves are often chosen ； If there is a stable supply of compressed air on site, a pneumatic valve can be selected. Furthermore, pneumatic valves are commonly used in fast-paced operations and explosive environments because they do not easily generate sparks. Regarding regulatory requirements, it is necessary to refer to specific industry standards and project technical specifications. Specifications related to switch indication typically address industrial automation and safety requirements, ensuring that operators can clearly understand the status of the valves. The requirements in chained states (such as ZSH/ZSL, namely safety high/safety low switches) typically arise in situations where it is necessary to ensure the safe operation of equipment under specific process conditions, such as in the chemical and petroleum industries. 2. Whether a pneumatic on/off valve uses one or two solenoids usually depends on the control logic and safety requirements. The configuration of a solenoid valve is usually used for simple on/off control ； The arrangement of two solenoids can provide more complex or safer control logic; for example, one can be used for opening the control while the other is used for closing it, or two solenoids can be employed in systems that require dual safety measures to enhance reliability. .