QDY5 Series Servo Valve

Description
QDY5 electro hydraulic servo valve is a key control part of the electro hydraulic servo control system, acting on electro hydraulic conversion and power amplification, which performance and reliability will directly affect the performance and reliability of the entire system.
To be specific, it can receive the electrical signal passed by system directly, and convert it into a load flow or pressure signal which is polarized, proportional and can control the electro hydraulic servo valve, so that the system will output hydraulic power to drive the corresponding executive bodies.

Application
The self-developed electro hydraulic valve have been widely used in metallurgy, aerospace, shipbuilding, automobile, textile and printing industry.

Features
1. QDY5 electro hydraulic servo valves have great performance on fast dynamic response, pressure sensitivity and linearity, small zero drift, low required input power.
2. Dry torque motorized electro hydraulic servo valve is equipped with double nozzles and flapper type single stage amplifier.
3. The machine features excellent performance, high dynamic response, steady operation, reliable and long service life.
4. Electro hydraulic valve uses super hard aluminum alloy shell, which has compact structure and light weight.

Parameters of QDY5 Electro Hydraulic Servo Valve

Type			QDY5
Supply oil pressure range		Mpa	1.5 to 21
Rated supply oil pressure		Mpa	21
Rated flow QN [L/min] (at valve pressure drop of 7MPa)		L/min	1, 2
Rated current		mA	30, 40
Hysteresis		%	≤3
Resolution		%	≤0.5
Non linearity		%	≤±10
Asymmetry		%	≤±10
Pressure gain		%	＞30
Internal leakage		L/min
Bias		%	≤±3
Zero drift of supply oil pressure(80-110% Ps)		%	≤±2
Zero drift of return oil pressure(0-20% Ps)		%	≤±2
Zero drift in temperature(-30 to +150)		%	≤±3
Frequency	Amplitude frequency width (-3db)	Hz	＞500
	Phase frequency width (-90°)	Hz	＞500
Work temperature		℃	-55 to +100
Net weight		Kg	0.3