Product Overview:
PUMASON company's pneumatic control valve is the automated production process medium flow control system is one of the most important products, it is widely used in various fluids and process conditions of the automated process control system.
PUMASON offers pneumatic control valve, is currently the latest generation of control valves, the use of IEC international standard. Installation height than other products by 30%, flow coefficient Kv is increased by 30%, material saving energy. There are many types of design and connection flange spacing. Action also has reliable performance and accurate flow characteristics, adjustable range, seat leakage rate is small, stable operation. Multi-spring actuator design. Thus, the unique advantages of this product will be widely used in various industrial sectors to achieve quality control in effect and economic benefits.
Working principle and structure:
PUMASON single-seat pneumatic control valve from the ZHA (B) pneumatic multi-spring film hospitality sector and VJP low-flow  Resistance through single-seat valve. Figure (a).
PUMASON sleeve valve from the ZHA (B) pneumatic multi-spring type of film entertainment agencies and VJM low flow resistance, sleeve valve. Figure (b). External pneumatic signal pressure chamber four input membrane, this pressure acting on the diaphragm to generate thrust, this force compression spring group, and to promote stem plunger and the spool at the beginning, until thrust and spring group is compressed against the force balance and stability in a trip up on. Accordance with the above principles, spool stroke size and the size of the input signal pressure to form a certain proportional relationship.
Pneumatic multi-spring diaphragm actuator can be classified according to mode of action and reaction are two kinds of acting. When the signal pressure increases, the putting out of film room to the direction of movement of the positive role of the executive body type, model ZHA type. When the signal pressure increases, putting back into the film room to the direction of implementation of the action of reaction type, model type for the ZHB. They are shown in (a) and Figure (b) shown in the implementing agency.
Pneumatic control valve in accordance with the different ways of switching can be divided into two kinds of pneumatic and gas open. Gas-off valve by the actuator and the valve is the role of composition. When the input signal into a lower limit on the pressure from the threshold, the valve from fully open to fully closed. The gas valve open and valve actuator by the reaction composition, the pressure when the input signal changes from the lower limit upper limit, the valve from fully closed to fully open. They are shown in (a) and Figure (b) below.
Pneumatic multi-spring diaphragm actuator height of short, light weight, easy assembly and calibration. It consists of the diaphragm, compression springs, trays, putting, frame, bushings, and other major components constitute a membrane cover. Diaphragm for the deep basin-shaped, small changes in effective area and high-quality rubber, the -40 ° C to +85 ° C temperatures, operating as usual. Combination of compression spring in the form of a multi-root. To reduce the height, putting the guide surface of the fine processing to improve the hardness and reduce roughness, to reduce backlash and increase the sealing effect. Reaction actuator O-ring type, and putter, sleeve with simple structure, reliable sealing, through proper design and precision machining, eliminating the need for the body structure adjustable compression spring can be fitted into one, reduce the transfer is trouble. Putting the connection with the use of stem slotted nut, handling flexibility.

Low flow resistance through single-seat and sleeve valve structure simple and compact, and has a large flow coefficient. The valve seat without using a single-bottom through the top-oriented structure of the body type, small size, light weight, smooth flow channel design, high efficiency characteristics. Valve and piping connections in the form using convex and concave-convex surface flange to adapt to different nominal pressure. Sub-normal body type and high temperature two types, for different operating temperature. Form a single seat on the valve spool valve plunger guide, for the cylindrical sleeve valve, driven by the sleeve's inner circle, by precision machining the sleeve out certain characteristics of fenestrae. They all have the exact flow characteristics, in line with international standards, IEC standards and assessment requirements under the slope of the deviation. Standard packing is PTFE molded packing requirements according to the site can choose flexible graphite, and other special packing.

Main parts:
Body, Bonnet: GS-45, AISI303, AISI316Ti; Cr-Mo steel (25Cr0.5Mo, 0Cr0.5Mo, SCPH21, Ti)
Trim: 1Cr18Ni9 (requires special materials or hardened to negotiate with the factory)
Packing: PTFE, flexible graphite
Diaphragm: NBR folder enhance polyester sediments
Compression spring: 60Si2Mn
Putter: 2Cr13
Membrane cover: A3
Bushing: 2Cr13
Gasket: rubber asbestos, 10,1 Cr18Ni9