Knowledge of Valves
1. Which three main factors should be considered in selecting valve actuators?
(1) The output of the actuator should be greater than the load of the valve.
(2) During the check of standard combination, consider whether the allowable pressure difference of the valve meets the technological requirements. When the pressure difference is large, the unbalanced force on the valve core should be calculated.
(3) It is necessary to consider whether the response speed of the actuator meets the technological operation requirements, especially the response speed of the electric actuator.
2. Compared with pneumatic actuators, what are the characteristics of electric actuators?
The driving power of the electric actuator is electric power. This actuator has large thrust and torque and high rigidity. But it has complex structure and poor reliability. The electric actuator in medium and small sizes is more expensive than the pneumatic one. It is often used in places without an air source or strict fire and explosion protection.
The electric actuator can fall into three types according to its output forms: linear actuators, and rotary actuators and multi-turn actuators.
3. Besides single-seated valves, double-seat valves and sleeve valves, what other valves have the function of flow regulation?
Diaphragm valves, butterfly valves, O-type ball valves, V-type ball valves and eccentric rotary valves are all with the function of flow regulation.
(1) The output of the actuator should be greater than the load of the valve.
(2) During the check of standard combination, consider whether the allowable pressure difference of the valve meets the technological requirements. When the pressure difference is large, the unbalanced force on the valve core should be calculated.
(3) It is necessary to consider whether the response speed of the actuator meets the technological operation requirements, especially the response speed of the electric actuator.
2. Compared with pneumatic actuators, what are the characteristics of electric actuators?
The driving power of the electric actuator is electric power. This actuator has large thrust and torque and high rigidity. But it has complex structure and poor reliability. The electric actuator in medium and small sizes is more expensive than the pneumatic one. It is often used in places without an air source or strict fire and explosion protection.
The electric actuator can fall into three types according to its output forms: linear actuators, and rotary actuators and multi-turn actuators.
3. Besides single-seated valves, double-seat valves and sleeve valves, what other valves have the function of flow regulation?
Diaphragm valves, butterfly valves, O-type ball valves, V-type ball valves and eccentric rotary valves are all with the function of flow regulation.
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