QDY3 Series Servo Valve

Description
QDY3 series electrohydraulic servo valve is a key control part of the electro-hydraulic servo control system, acting on electro-hydraulic conversion and power amplification. The pilot servo valve uses a double-nozzle flapper valve as the pilot level, and furnished with electric feedback for main valve core position.
Servo Valve products researched & developed independently by her have been widely used in metallurgy, aerospace, shipbuilding, automobile, textile and printing industry.

Working Process
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. The performance and reliability will directly affect the performance and reliability of the entire system, so it is the core of electro-hydraulic servo-control system.

Features
1. The electrohydraulic servo valve uses a double-nozzle flapper valve as the pilot level, and furnished with electric feedback for main valve core position.
2. With good dynamic behavior and low energy consumption, it meet requirements for valves with high frequency response and flow from industrial fields.
3. Adopting an external controlling amplifier, the pilot servo valve is easy to adjust.
4. Allowing users selecting external controlling and discharging way for pilot controlling oil.

Technical Parameters of Electrohydraulic Servo Valve

Type			QDY3
Supply oil pressure range		Mpa	12 to 21
Rated supply oil pressure		Mpa	21
Rated flow QN [L/min] (at valve pressure drop of 7MPa)		L/min	400, 500
Rated current		mA	10
Hysteresis		%	≤4
Resolution		%	≤1
Non linearity		%	≤±10
Asymmetry		%	≤±10
Pressure gain		%	＞30
Internal leakage		L/min	≤4
Bias		%	≤±3
Zero drift of supply oil pressure(80 to 110% Ps)		%	≤±3
Zero drift of return oil pressure(0 to 20% Ps)		%	≤±2
Zero drift in temperature(-30 to +150)		%	≤±4
Frequency	Amplitude frequency width (-3db)	Hz	≥30
	Phase frequency width (-90°)	Hz	≥35
Work temperature		℃	-30 to +100
Net weight		Kg	9.8