Chinabase Machinery is a group of manufacturing facilities, offering one-stop solution for mechanical power transmission products in China. We can supply a full-range of power transmission products, such as chains, sprockets and plate wheels, pulleys, timing belt pulleys，gearboxes, motors, couplings, gears and racks. Our product range also covers locking assemblies (clamping elements/locking device), taper bushes,timing belt，QD bushes, bolt-on hubs, torque limiters, shaft collars, motor bases and motor slides, chain detachers, chain guides, universal joint, rod ends and yokes.
Selection analysis
Control valve body type selection control valve body types, valve types are commonly used through single seat, through two seater,angular, diaphragm, small flow, three links, eccentric rotation,butterfly, sleeve type, ball and so. In the specific choices, do the following considerations
(1) disc shape of the structure mainly based on the choice of flow characteristics and considerations such as power imbalances.
(2) the wear resistance when the fluid medium is a suspension ofhigh concentration of abrasive particles, hard materials to the internal valve.
(3) corrosion resistance as the medium is corrosive, as we choose simple valve.
(4), medium temperature pressure when the medium temperature,high pressure and great change, should choose the valve core and valve seat materials, temperature, pressure changes in the small valve.
(5) to prevent flashing and flashing and cavitation cavitation produced only in liquid medium. In the actual production process,steam and air will form a vibration and noise, shorten the life of the valve, so the choice of valve should be to prevent the valve steam and cavitation.
The choice of control valve actuators in order to adjust the valve towork properly, equipped with the implementing agencies to be able to generate sufficient output power to ensure the seal and valveopening height.
For double acting pneumatic, hydraulic, electric actuator, generally not reset spring. The size of the force and the direction it has nothing to do, therefore, lies ininguting agencies rotation ascertain the maximum output power and torque motor. For single actingpneumatic actuator, output force and the valve opening, valve on the emergence of the force will also affect the motion characteristics, and therefore requires the establishment of force balance in the whole range of valve opening.
Determine the type of actuator on the actuator output force is determined, based on the use of environmental technologyrequirements, select the appropriate enforcement agency. For the scene, explosion-proof requirements, should use pneumatic actuator. From energy considerations, should try to use the electric actuator. If the adjustment of high precision, can choose thehydraulic actuator. Catalytic reactor such as power plants and transparent machine speed regulation, the refinery temperature control etc..
Mode of action of control valve selection mode of action of control valve selection is the only when the pneumatic actuator, its mode of action is formed through the combination of positive and negative effects of valve actuator and the positive and negative effects.There are 4 combinations that are positive (gas off type), positive and negative (gas open type), anyway (gas open), anti (gas off type), the combination of four kinds of formation of the mode of action of control valve pneumatic open gas shut two. The mode of action of control valve selection, mainly from three aspects of a)technology for the production of security b) medium characteristic of C) to ensure product quality, to minimize economic loss.
