Toyo Valve(Shanghai)Co.,Ltd

First, the choice of the cylinder:
1, according to the design requirements of the other side to select the type of cylinder:
A, if the requirements of the gas source fault (gas loss) when the valve clearance (FC) or open (FO), then: select a single acting cylinder.
B, gas source fault valve position does not require, then: select the double acting cylinder.
Note: if the account from the security of gas supply failure can not require valve open or closed, from speaking: as far as possible to choose the double acting cylinder, because relatively speaking, the single acting cylinder with a valve configuration than the specifications of a double acting cylinder. The specific situation is different, there will be different, but in general, the configuration of the single acting cylinder will be larger than the double acting cylinder.
Operating principle diagram of double acting actuator
Double acting cylinder output torque is the effective area of cylinder 2 x pneumatic friction force transmission efficiency loss
Operating principle diagram of single acting actuator
Single acting cylinder output torque is the effective area of cylinder 2 x pneumatic friction transmission efficiency loss force spring working pressure
2, according to the valve torque value of the selection of the model of the cylinder:
A, the role of the cylinder based on the selection:
The allowable pressure is greater than or equal to the output torque of the valve torque * safety factor
B, the role of the cylinder based on the selection:
An allowable pressure output torque (0 DEG and 90 DEG) or torque X factor of safety valve
The number of spring two rated output torque (0 DEG and 90 DEG) or torque X factor of safety valve
3, the choice of magnetic coil:
A, double electric control of the selection of double coil solenoid valve.
B, customer requirements of a single or no single, double electric control requirements of the general by a single coil (with a spring reset).
C, the user requires low power consumption of the selection of low power coil, not required by the conventional power consumption.
4, the choice of the electromagnetic valve explosion-proof grade:
A, provide customers with explosion-proof environments selection (safe, flameproof or ordinary explosion-proof type etc.)
5, electromagnetic valve gas source and the choice of electrical interface:
A, according to customer requirements selection, not required by the conventional air source interface 1/4 "NPT or 1/2" NPT PT, the electrical interface or PT in situ automatic operation button selection.
B, according to customer requirements selection, not required by conventional with manual and automatic switching button selection.
6, the choice of limit switch:
1, limit switch brand choice:
A, according to the customer's designated brand selection.
B, according to supporting manufacturers, delivery, price and quality, such as comprehensive selection.
2, limit switch type selection:
A, according to customer design requirements select mechanical switch or proximity switch or magnetic switch and so on.
B, according to customer design requirements to select the number of switches, there is no requirement according to the conventional: switch two bit type selection.
3, limit switch protection and the choice of explosion-proof grade:
Provide explosion-proof requirements of the using environment selected by customer (flameproof or intrinsically safe type, waterproof type etc.).
4, the choice of limit switch electric interface:
Selected according to customer requirements, not selected according to standard specification: 2 * 1/2 "NPT waterproof, explosion-proof type 2 * 3/4" NPT.
5, limit switch current output signal selection:
A, according to customer requirements: the output of 4 ~ 20mA or 20 ~ 4mA.
B, does not require this item is not selected.
6, the choice of location:
Unless the customer has special requirements of 0 ~ 180 degrees (open - yellow, off red) position indicator, generally by standard 0 ~ 90 degrees (open - green, close - red) position indicator.