This series solenoid valve is developed on the base of absorbing advanced technology in the world. Its performance reaches or over the level of same product in the world. It features new design, good appearance, reliable performance and with good insulating, waterproof, damp-proof, anti-vibration, anti-acid and anti-alkali. This serise solenoid valve is suit for refrigeration pneumatic and hydraulic system.

FDF-M series solenid valve is pilot type valve.
While energized in coil, the coil emerges magnetic filed and pick up plug stem, open the small orifice. Then the pressure in upside of valve reduced, so the pressure difference between both side of diaphragm happen, lead to diaphragm lift. So open the main orifice. When main orifice open, even if small pressure difference exist between both side of diaphragm, but because flowing inertia function, the diaphragm will stop in upside again. While de-engized in the coil, plug stem will drop and close the small orifice because of spring force and its weight. The flow media enter into upside of diaphragm through throttle hole, then pressure in both side of diaphragm, balances, then the diaphragm drop and close the main orifice.
Note:Show”k” after model means normal open solenoid valve.E.g：FDF8MK means it is normal open solenoid valve with orifice 8mm．A-kidney Shape Flange B-SAE E-manual stem F-ODF Solder Square Flange．

1.The valve must install in horizontal pipe line under vertical position. The flow direction must be meet the arrow direction in valve body.
2.The coil input voltage must meet rated input voltage showed on the label. Departure coil from valve when energized in coil is not permitted in order to avoid damage the coil.
3.According to valve with manual function, it must turn manual bar to open the valve before doing system air tightness in order to avoid to damage diaphragm.
4.When brazing the valve with connect tube in system, follow points are very important:
a)Before brazing, coil must be departure and use wet fabric cover the valve body to avoid to damage valve part because of high temperature when brazing.
b)It must avoid the brazing flame face to valve body.
c)It is better to adopt low temperature type silver brazing bar.