HMC CATALOGUE - Kawasaki Precision Machinery - (Version JPG) - Page n° 19 - PDF Catalogue | Technical Documentation

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Valve, Control valve, Pressure reducing valve, Solenoid valve, Controller

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Constant pressure valve (CP)

Page 18

Override valve selection

The constant pressure valve can be fitted with a CETOP3 override valve, which when activated moves the constant pressure valve spool in a direction to select maximum displacement. The override option is available with a lever operated or a solenoid activated valve, see fig.5 and fig.6.

Fig.6 includes the Tj speed sensor option, which when combined with the T401 module can be used to automatically select maximum displacement at a pre-set low speed (see page 56).

Tj speed sensor

Fig. 5

Fig. 6

Motor operation at constant inlet pressure

Fig. 7 shows the relationship between motor displacement and motor inlet pressure. If the inlet pressure is below 7 bar, then the motor will be in its maximum displacement (minimum speed). As the inlet pressure level increases above 7 bar the valve spindle and spool will move directing flow to the large displacement diameter piston (within the shaft assembly), which will force the motor to its minimum displacement (maximum speed).

A further increase in load will increase the motor inlet pressure until the valve pressure setting is reached. At this point, the motor displacement will move away from minimum towards maximum displacement until the motor torque, at valve pressure setting, equals the load torque.

The motor displacement will now automatically adjust itself to maintain the inlet pressure constant at the valve pressure setting. Any further change in load will cause a proportional action from the pressure sensing valve to maintain the motor inlet pressure constant.

HMC270/280/40 MOTOR WITH A VALVE PRESSURE SETTING OF 190 bar

200 180 160 140 120 100

80 60 40 20 0


	₌
	z
	E		Load dependent range at a CP setting of 190 bar
	E
	E
	E
	E
	E

	E
	- i i i		...........^............ii

(0 _q

IT) IT)

k_ o

o 2

100

150

200

250

300

Motor Displacement (cu.in./rev.)

Fig. 7

HMC CATALOGUE - Kawasaki Precision Machinery - #19

Valve, Control valve, Pressure reducing valve, Solenoid valve, Controller