Product Description:

QFH air filter reducer is a pneumatic diaphragm control valve combination of an auxiliary device, by input 0.3 ~ 1.0MPa compressed air, the pneumatic remote control plate and the valve positioner to provide 0.14 ± 10% MPa clean gas source.   

Working principle:

When the input of 0.3 ~ 1.0MPa compressed air, into the filter chamber (A) for water, oil, dust treatment. As a result of the spring of the given spring to push the ball valve, so the pressure through the ball valve flow into the output pipe, and through the small hole into the feedback chamber (B), then the pressure on the diaphragm force and a given spring force to balance. But because the output pressure by the use of external interference, the output pressure is high or lower than the given value. If the output pressure is lower than the given value, the force on the diaphragm is out of balance with the given spring force, the film is displaced downward, and the ball valve is opened for air pressure compensation. If the output pressure is higher than the given value, the diaphragm is displaced upward, and the stem and diaphragm core are separated, and the air pressure is discharged from the hole to the atmosphere until a new equilibrium is reached. Thus, the output pressure can always be set at the desired setpoint.
         

Maintenance and repair :

Pressure adjustment: the output pressure and a given pressure does not match, can be adjusted, starting from the top plug, input 0.3 ~ 1.0MPa compressed air, screw the adjustment screw to change the output pressure, clockwise adjustment output pressure, Adjust the pressure is reduced, adjust the timing of the output pressure gauge can be 0.14MPa, cover the cap.

Discharge and drainage: the bottom of the case there is a knurled screw, for the discharge of water, the annual discharge of at least one. 
          

Filter cleaning:

Wash at least once a year, cleaning the valve to be removed from the pipeline, with gasoline or carbon tetrachloride cleaning, washing with compressed air after the scouring of the net, the filter can be reloaded. Its structure as shown in Figure QFH type, mainly by the adjustment screw 1, the given spring 2, diaphragm 3, ball valve 4, filter 5, stem 6 and drainage screws 7 and so on.   

QFH air filter reducer is a pneumatic instrument auxiliary unit, it will be from the air compressor air source filter purification, and can be adjusted to the required pressure to regulate the pressure for all types of pneumatic instruments to provide gas source. Structure principle Air filter pressure regulator designed by the principle of balance by the hand wheel, given the spring, cover, diaphragm components, shell, ball valve, filter components and shells and other components. When the air source input air filter pressure reducer, first through the filter chamber, the gas source for purification. Adjust the pressure by adjusting the handwheel to push the compression spring to generate thrust, and then open the ball valve until the output pressure reaches the given value. Regulator is due to the output pressure through the feedback hole into the feedback chamber to produce an upward thrust, compared with the pressure of a given spring, when the equilibrium state, the output pressure can be stable.        
  

Parameters and specifications:

Model	QFH-111	QFH-211	QFH-212	QFH-213	QFH-221	QFH-222	QFH-223	QFH-241	QFH-261
Air supply pressure MPa	0.3 to 0.7				0.4 to 0.7			0.5 ~ 1	0.7 ~ 1
Maximum output pressure MPa	0.16				0.25			0.4	0.6
Maximum output flow m3 / n                     (standard state)	3		12	30	3	12	30	3
Pressure characteristics	≤1.5
Flow characteristics	≤ 7
Air consumption NL / h	150		250	300	250	350	450	400	500
Filter Element Pore nominal pore size	40 to 60 μm
Use ambient temperature	-25 ~ 55 ℃
Relative humidity	5 to 95%
Take over the thread size	M10 × 1		G 1/2 "	G 3/4 "	M10 × 1	G 1/2 "	G 3/4 "	M10 × 1	M10 × 1
Dimension F × H	Φ70 × 140	Φ70 × 160	Φ100 × 225	Φ120 × 265	Φ70 × 160	Φ100 × 225	Φ120 × 265	Φ70 × 160