Under the working conditions of corrosive media, anti-corrosion is the most critical link in chemical equipment. If the metal material of chemical valves cannot be selected correctly, a little carelessness will damage the equipment, or even cause an accident or even a disaster. The editor below will give you a brief introduction to which special valves in the chemical industry:
In all temperature ranges, gate valves are suitable for most switching operations, non-vibrating hydrocarbons and utilities. When the work vibrates, the gate valve can be opened or closed from its normal position. If the valve stem packing is not carefully adjusted, the gate valve will not have better torque characteristics than ball valves and plug valves, but it does not have the convenient operating characteristics of 90-degree rotation.
For manually operated gate valves of DN50 (2in) size or larger, the solenoid valve brand should be equipped with an elastic gate or an expansion gate. Closing gate valves generally do not have valve chamber pressure protection.
Rising stem gate valves without protection devices are not recommended. The marine environment will corrode the exposed stem and threads, making the valve difficult to operate and easily damaging the stem packing.
The gate valve with reaction force plate is suitable for the operation of automatic shut-off system. A simple push-pull operator can be used for these valves with 2-position 3-port solenoid valves, thus avoiding the complicated joystick cams normally required for ball valves and plug valves. The movable part is connected to the gate valve with the power operating device, which can eliminate the pollution caused by paint and corrosive products.
In throttling operations, gate valves cannot be used. Especially for sand-containing fluids, throttling will damage the sealing surface.
The working temperature of the soft-seal gate valve is limited by the sealing material.
When a good throttling control is required (for example, the bypass pipe and the control valve have a small discharge hole), the stop valve is the most suitable.