Choose Valve Body:
Step 1: determine the working pressure of the ball valve
When the valve is closed, you must be sure that it is in the range of pressure.
Step 2: determine the temperature range of the ball valve
Valves are generally used to handle hot fluid or cold fluid.It is very important to determine how low or high temperature is the medium of the valve. There are different materials, such as ceramic, stainless steel, and PVC are used in the manufacture of valves.Each of them is applied to a certain temperature range.
Step 3：Determine what kind of fluid through the valve
Specific applications and fluid control systems are designed to handle different types of fluids.Some valves are used to deal with dams and reservoirs of hydroelectric power plants.There is also used for the normal flow of chemicals.There are a number of special design, used for radioactive material, to ensure that the valve will not leak radiation.
It is also important to make sure whether the fluid is corrosive.These are helpful for choosing the body material. This step is also used to ensure the safety of the valve staff.
Different flow valve is designed for different purposes, is too thin or too thick are not suitable, so correct size of the valve is very important to choose the size of the valve.
1. Torque protection
To prevent actuator in the middle of over torque, This function not only protects the valve, but also protects the actuator itself. The torque is set by the setting device.
2. Motorized valve position limit protection
Actuator runs to close and open the limit position automatically stop (with a set of working modes).
3. Automatic phase adjustment
electric actuator automatic detection of three-phase power supply terminal of the access, by the appropriate logic operation, the decision of the implementation of the operation of the mechanism when the AC contactor, in order to ensure the electrical connection to the right. If there is no automatic phase adjustment function, may be due to damage to the valve and connection order error, Because of the automatic phase adjustment function, the actuator power supply wiring can not consider the sequence.
4. Instantaneous reversal protection
When the actuator receives commands for the opposite direction, it automatically adds a time delay, to prevent unnecessary wear of the valve shaft and gear box.
5. Power shortage phase protection
Motorized valve actuator has a perfect power supply shortage protection function. It uses a combination of monitoring voltage and current method, It can't only detect the phase of power supply when the motor is at rest, also can detect the power shortage in the operation of the motor. So that prohibit motor operation, to avoid the lack of phase operation caused by motor overheating Notice:The vast majority of the motor phase is in the motor running process.
What ever the actuator to open or close the direction of action, The torque protection function is temporarily disabled within 5~10 seconds after the signal is sent to the motor. (If actuator doesn't act in the time of the 5~10 seconds, Control circuit is cut off the power supply of the motor.) This feature can be achieved when the valve stuck solution card.