First, product overview:

　　Pneumatic control valve is to compressed gas as the power source, to the cylinder as the actuator, and with the help of valve positioner, converter, solenoid valve, position valve, gas storage tank, gas filter and other accessories to drive the valve, to achieve switching volume or proportional adjustment, receive industrial automation control system control signals to complete the adjustment of the pipeline medium: Flow, pressure, temperature, liquid level and other process parameters. Pneumatic control valve is characterized by simple control, rapid response, and intrinsically safe. Usually by the pneumatic actuator and the control valve connected after installation and debugging of the combination of instruments.

Second, product classification:

A. According to the valve action mode, it can be basically divided into straight stroke and Angle stroke.


B. Pneumatic regulating valve action mode:


Gas open type (normally closed type) is when the film head air pressure increases, the valve to increase the opening direction action, when the input pressure limit is reached, the valve is in full open state. In turn, when the air pressure decreases, the valve moves in the direction of closing, in the absence of input air, the valve is completely closed. Usually we call the gas open type regulator the fault close type valve.


Air close type (normally open type) action direction is just opposite to air open type. When the air pressure increases, the valve to close the direction of action; When the air pressure decreases or does not exist, the valve should be opened in the open direction or fully open. Usually we call the gas closed type regulator the fault open type valve. The choice of gas opening and closing is based on the safety of the process production. When the air source is cut off, the regulator is safe in the closed position or the open position.


The choice of gas opening and closing is based on the safety of the process production. When the air source is cut off, the regulator is safe in the closed position or the open position.

Third, pneumatic control valve use and characteristics:

A, the use of pneumatic control valve is a right Angle rotation structure, it is used with the valve positioner, can achieve proportional adjustment; V-type valve core is most suitable for various adjustment occasions, with large rated flow coefficient, adjustable ratio, good sealing effect, sensitive adjustment performance, small volume, can be installed vertically. Suitable for controlling gas, steam, liquid and other media.


B. Features: Composed of V-shaped valve body, pneumatic actuator, positioner and other accessories; There is an approximately equal ratio of natural flow characteristics; Double bearing structure, small starting torque, good sensitivity and induction speed; Super shear ability.


C. Pneumatic piston actuator adopts compressed air as power source, and drives the bending arm to rotate 90 degrees through the movement of the piston, so as to make the valve open and close automatically. Its components are: adjusting bolt, executive body, bend arm, cylinder block, cylinder shaft, piston, connecting rod, cardan shaft.


D, the working principle of pneumatic regulating valve: pneumatic regulating valve is composed of actuator and regulating mechanism. The actuator is the thrust component of the regulating valve, which generates the corresponding thrust according to the size of the pressure of the control signal to promote the action of the regulating mechanism. The valve body is the regulating part of the pneumatic regulating valve, which is directly in contact with the regulating medium to regulate the flow of the fluid.

Fourth, the installation principle

　　

(1) pneumatic control valve installation position, a certain height from the ground, the valve above and below to leave a certain space, in order to carry out valve disassembly and repair. For regulating valves equipped with pneumatic valve positioner and hand wheel, it must be ensured that the operation, observation and adjustment are convenient.


(2) The regulator should be installed on the horizontal pipeline, and up and down the pipeline vertical, generally to be supported under the valve, to ensure stable and reliable. For special occasions, when the regulator is installed horizontally on the vertical pipeline, the regulator should also be supported (except for small diameter regulator). Installation, to avoid additional stress to the regulating valve).


(3) the operating temperature of the regulating valve should be in (-30 ~ + 60), the relative humidity is not greater than 95%.


(4) The regulating valve before and after the position should be straight pipe section, length is not less than 10 times the diameter of the pipeline (10D), in order to avoid the valve straight pipe section is too short and affect the flow characteristics.


(5) The diameter of the regulating valve and the process pipeline is not the same, should be connected by reducing pipe. In the small diameter control valve installation, available threaded connection. The fluid direction arrow on the valve body should be consistent with the direction of the fluid.


(6) To set up bypass pipeline. The purpose is to facilitate switching or manual operation, can be repaired without stopping the control valve.


(7) The regulator should thoroughly remove foreign bodies in the pipeline before installation, such as dirt, welding slag, etc.

Fifth, use precautions

1, the valve should be stored in a dry room, both ends of the channel must be blocked. Do not store in piles


2, long-term storage of the regulating valve should be regularly checked, remove dirt, in each moving part and processing surface should be coated with anti-rust oil to prevent rust.


3, the valve should be installed on the horizontal pipe, vertical installation is required. Stem up.


4. Installation is required according to the direction of media flow indicated by the arrow in the diagram.

Sixth, parts and components materials

14	Pneumatic film actuator			1
13	Vacuum filter		piece	1
12	Intelligent valve positioner linear 4-20mA, explosion-proof class EXdIICT6
11	Pressure plate	WCB	piece	1
10	Packing gland	20Cr13	piece	1
9	packing	PPL	piece
8	Valve stem	304	piece	1
7	Valve cover	WCB	piece	1
6	washer	Metal wound pad	piece	2
5	Pin shaft	304	piece	1
4	Pressure jacket	CF8	piece	1
3	spool	304	piece	1
2	Valve seat	304	piece	1
1	Valve body	WCB	piece	1
Serial number	name	material	unit	quantity

Notice to quotation:

1, valve body parameters: caliber, working pressure, valve body material, using medium, connection form and other parameters


2, actuator: actuator form, control mode, control signal (4-20MA), mode of action (gas-open type Gas-off type)


3, optional accessories: solenoid valve, limit switch, two couplings


Please try to provide detailed parameters about each standard pneumatic ball valve, to facilitate our technical personnel for your accurate selection.