Combination ball valves can be customized
The structure principle of pneumatic actuator ball valve
by：AIRWOLF
2021-01-20
Structure of pneumatic actuator ball valve
the structure and principles of pneumatic actuator ball valve according to a polishing ball core (basically Including channel) Double in two seat this ( Upstream and downstream) , the rotation of the globe to intercept or fluid flow through the ball core, upstream and downstream of the differential pressure produced by the force the ball close to the downstream seat ( The floating ball structure) 。 This kind of circumstance operation by the ball is the torque of the valve core and valve seat, friction between stem and packing. Moment took place in the event of a differential pressure rating and ball core rotates butterfly valve in the closed position to open the direction.
structure of butterfly valve is basically according to fixed to the axis of the butterfly plate. In the closed position the butterfly plate and valve seat seal, when the butterfly plate rotation ( Around the valve stem) After parallel to the flow of fluid, the valve is in full open position. On the contrary when the butterfly plate perpendicular to the flow of fluid, the valve is in closed position. Operation and the torque is the butterfly plate of butterfly valve seat, the friction between stem and packing, and differential pressure forces acting on the butterfly plate also affects the moment when the operating torque as the valve in the closed at most, after small spin, torque will significantly reduce the cock structure is the basic principle according to seal in the tapered plug body plugs. In a direction of the plug has a channel. As the plug screwing in the seat to open and close the valve.
the operating torque is usually not affected by the pressure of the fluid but by opening and closing process of the seat and tapped the friction between the. The valve in the closed moment at most. Because there are affected by pressure, always maintain high torque in the rest of the operation double-acting actuators shall be chosen on DA article series pneumatic actuator structure as an example of gear type is the output torque of the actuator piston pressure ( Air pressure supplied) On the pitch circle radius ( Arm) The income. And small friction resistance of high efficiency. Clockwise and counterclockwise output torque is linear.
under normal operating conditions, the recommended safety coefficients of the structure of the double-acting pneumatic actuators for 25 50% single-acting actuator shall be chosen on the SR series pneumatic actuator structure as an example in the application of the reset spring, the output torque is in the process of two different operating income, according to the schedule position, each operation producing two different torque values.
spring-return actuator output torque by force, Air pressure or spring) On arm the first kind of situation: the output torque is made up of air pressure into the lumen after compression spring, known as' air travel output torque in this case, the air pressure to the piston position from 0 degrees to 90 degrees, due to the spring compression reaction, from the start torque rating decreased until the time of conditions: the output torque is of cavity loss of gas spring back the force on the piston, known as' spring travel output torque in this case, because the spring elongation, output torque decline gradually from 90 degrees to 0 degrees such as described above, single-acting actuator is based on the two conditions to create a balanced torque on the basis of the design.
in each case, by changing the number of spring and air pressure on each side of the relationship ( Such as 2 root spring and 5 per side. 5 the gas source, or vice versa) , it is possible to obtain unbalanced moment, in the spring reset applications can obtain two conditions: the loss of gas open or closed. Under normal working conditions, the recommended safety coefficients of the structure of the spring return pneumatic actuators for 25 50%. The selection of
spring return actuators example ( At the same time see the technical data sheet) :
spring shut ( Loss of air pressure)
ball valve torque = 80 nm safety coefficient (
25%) = 80 nm + 25% = 100 nm air pressure is
= 0. 6 mpa
SY - was selected The SR actuators is SR125 - 05, because can produce the following value:
spring trip 0 o = 119. 2 nm
spring 90 o = 216. 2 nm
air travel 0 o = 228. 7 nm
air travel 90 o = 118. 8NM
the structure and principles of pneumatic actuator ball valve according to a polishing ball core (basically Including channel) Double in two seat this ( Upstream and downstream) , the rotation of the globe to intercept or fluid flow through the ball core, upstream and downstream of the differential pressure produced by the force the ball close to the downstream seat ( The floating ball structure) 。 This kind of circumstance operation by the ball is the torque of the valve core and valve seat, friction between stem and packing. Moment took place in the event of a differential pressure rating and ball core rotates butterfly valve in the closed position to open the direction.
structure of butterfly valve is basically according to fixed to the axis of the butterfly plate. In the closed position the butterfly plate and valve seat seal, when the butterfly plate rotation ( Around the valve stem) After parallel to the flow of fluid, the valve is in full open position. On the contrary when the butterfly plate perpendicular to the flow of fluid, the valve is in closed position. Operation and the torque is the butterfly plate of butterfly valve seat, the friction between stem and packing, and differential pressure forces acting on the butterfly plate also affects the moment when the operating torque as the valve in the closed at most, after small spin, torque will significantly reduce the cock structure is the basic principle according to seal in the tapered plug body plugs. In a direction of the plug has a channel. As the plug screwing in the seat to open and close the valve.
the operating torque is usually not affected by the pressure of the fluid but by opening and closing process of the seat and tapped the friction between the. The valve in the closed moment at most. Because there are affected by pressure, always maintain high torque in the rest of the operation double-acting actuators shall be chosen on DA article series pneumatic actuator structure as an example of gear type is the output torque of the actuator piston pressure ( Air pressure supplied) On the pitch circle radius ( Arm) The income. And small friction resistance of high efficiency. Clockwise and counterclockwise output torque is linear.
under normal operating conditions, the recommended safety coefficients of the structure of the double-acting pneumatic actuators for 25 50% single-acting actuator shall be chosen on the SR series pneumatic actuator structure as an example in the application of the reset spring, the output torque is in the process of two different operating income, according to the schedule position, each operation producing two different torque values.
spring-return actuator output torque by force, Air pressure or spring) On arm the first kind of situation: the output torque is made up of air pressure into the lumen after compression spring, known as' air travel output torque in this case, the air pressure to the piston position from 0 degrees to 90 degrees, due to the spring compression reaction, from the start torque rating decreased until the time of conditions: the output torque is of cavity loss of gas spring back the force on the piston, known as' spring travel output torque in this case, because the spring elongation, output torque decline gradually from 90 degrees to 0 degrees such as described above, single-acting actuator is based on the two conditions to create a balanced torque on the basis of the design.
in each case, by changing the number of spring and air pressure on each side of the relationship ( Such as 2 root spring and 5 per side. 5 the gas source, or vice versa) , it is possible to obtain unbalanced moment, in the spring reset applications can obtain two conditions: the loss of gas open or closed. Under normal working conditions, the recommended safety coefficients of the structure of the spring return pneumatic actuators for 25 50%. The selection of
spring return actuators example ( At the same time see the technical data sheet) :
spring shut ( Loss of air pressure)
ball valve torque = 80 nm safety coefficient (
25%) = 80 nm + 25% = 100 nm air pressure is
= 0. 6 mpa
SY - was selected The SR actuators is SR125 - 05, because can produce the following value:
spring trip 0 o = 119. 2 nm
spring 90 o = 216. 2 nm
air travel 0 o = 228. 7 nm
air travel 90 o = 118. 8NM
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