Structure and Principle

The actuator has two forms: positive and negative. When the signal pressure input is 0.2Mpa, the push rod extends out of the diaphragm chamber (moves downward), which is called positive action, and cooperates with the valve to form an air tight type. When the signal pressure input is 0.2Mpa, the push rod retreats into the membrane chamber (moves upward), which is called a reaction and cooperates with the valve to form an air opening. Three way valve, due to the simultaneous presence of opening and closing inside the valve, there is no distinction between gas opening and gas closing. Its principle: When the signal pressure is 0, due to the pre tension force of the spring, the valve core is in its initial state, normally open or normally closed. When the signal pressure is input at 0.2Mpa, it acts on the diaphragm to generate thrust, compress the spring, drive the push rod and valve stem, and move the valve core to the limit position, achieving full valve closure (full open) or changing the flow direction of the medium. When the signal pressure input is "0", the force acting on the diaphragm disappears, and due to the reaction force of the spring, the valve core returns to its initial state.

Model preparation instructions

Main Technical Parameters and Performance Indicators

1. The permissible pressure difference refers to the data configured with standard actuators. If users need to increase the permissible pressure difference, our factory can meet the users' needs by changing the actuator or spring.
2. For the shut-off valves with DN250 - 350, our factory designs them specifically according to the users' process parameters.
3. For the single - seat hard - seal leakage data, the first row is the water test, △P = △PMAX; the second row is the gas test, △P = 0.35MPa.
4. Please specify separately if stricter leakage requirements are needed.

Main Component Materials

External Dimensions and Weight

When equipped with a simple handwheel: for DN15 - DN50, the total height increases by 90; for DN65 - DN100, the total height increases by 125; for DN100 - DN200, the total height increases by 225. The weight is based on PN16 as an example.

Connection Dimensions and Standards

• Flanges are in accordance with GB/T9113 - 2000 (default standard), and can also be in accordance with JB/T79.1 - 94, JB/T79.2 - 94, or HG20592 - HG20635 - 97.

• Flange sealing surface type: Convex - faced flange for PN16; Convex - faced flange for PN25; Male - and - female faced flange for PN40, PN64 (63), with the valve body being the female - faced flange.

• Flange end - to - end distance is in accordance with GB12221 - 89 (other standards must be specified).

• Welding connection groove is in accordance with GB12224 - 89.

• Actuator air signal interface: Internal thread M10×1 (DN ≤ 100), internal thread M16×1.5 (DN > 100).

• The valve body flange and flange end - to - end distance can be manufactured according to the standards specified by users, such as ANSI, JIS, DIN, etc.

Available Accessories

Handwheel, Simple Handwheel, Solenoid Valve, Travel Switch (Contact Position Indicator), Air Filter Regulator, Diaphragm, Flange

1. If the model has not been selected before ordering, please provide us with the operating parameters:
   (1) Nominal diameter DN (mm);
   (2) Nominal pressure (MPa or bar);
   (3) Fluid properties (including medium temperature, viscosity, or acidity/alkalinity);
   (4) Pressure before and after the valve (pressure differential);
   (5) Requirements for flow characteristics;
   (6) Materials of valve body and valve core;
   (7) Connection type;
   (8) Driving method (provide air supply pressure, driving voltage);
   (9) Supporting accessories (for pneumatic valves, it is recommended that users install an air filter triplet and a 2-position 5-way solenoid valve);
   (10) On-site working conditions.
2. If the product model of our company has been selected by the design unit, please order directly from our production department according to the model;
3. When the application occasion is very important or the pipeline is relatively complex, please provide the design drawings and detailed parameters as much as possible, and our experts will review and check them for you.