Control system

30MPa

Singleacting

Single acting clamp is controlled and operated with control unit model HCD□H-S and coupling valve model VHD.

Control unit model HCD□H-S

Coupling valve model VHD

Page →169

Pages →160, 161

Control unit (HCD□H-S) converts air pressure to hydraulic pressure by actuation of air driven Pascal pump. Once circuit pressure
is attained to the set pressure, it stops pumping then keeps the hydraulic pressure.
Coupling valve (VHD) is placed between a control unit and single acting clamps, and it allows to disconnect the control unit fromthe valve by means of hydraulic coupler. Built-in check valve in coupling valve can positively seal the pressure.

Clamping operation

Hydraulic pressure source disengagement (during processing)Work clamp (single acting)Work clamp (single acting)Coupling valve
model VHD

Coupling valve
model VHDWork clamp (single acting)Coupling valve
model VHD

Operation lever

Operation lever
Operation lever

Workpiece

Coupler

Switching valve

Workpiece

Workpiece
Coupler

Switching valve

Air

Control system

Unclamping operation

Switching valve

AirAir

CLAMP

CLAMP

CLAMP

UNCLAMPUNCLAMPUNCLAMP

Control unit
model HCD□H-S

After coupler is connected, workpiece isclamped by aligning switching valve ofcontrol unit to clamping circuit.

Control unit
model HCD□H-SCoupler is released by positioning operation
lever of coupling valve to clamping side andaligning switching valve of control unit withunclamping.

Control unit
model HCD□H-S

Workpiece is taken out after coupler isconnected, by positioning operation leverof coupling valve to unclamping side, tounclamp.

Coupling valve
model VHD
Non-leak valve

Switching valve

Hydraulic hose

Single acting clamp

Hydraulic coupler

AirPascal pumpLine ﬁlter

Control unit model HCD□H-S

Since Pascal pump does not raise oil temperature like electrical pumps, it does not trigger pressure drop (reduction in clamping force) after
clamping due to difference between ambient temperature and oil temperature. Fluctuation of pressure due to changes in ambient temperature,
however, does occur. (This fluctuation presents minimal problems with ordinary cutting processes. Inquire for details.)

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Control system

30MPa

Control unit model HCT-□

Reducing valve model VRG

Page →172

Pages →162, 163

SingleactingInternal hydraulic pressure of circuit can be partially reduced.

Compact hydraulic control unit for air drive and manual operations.
Control unit (HCT-□) converts air pressure to hydraulic pressure
by actuation of air driven Pascal pump. Once circuit pressure is
attained to the set pressure, it stops pumping then keeps thehydraulic pressure.

(Example) For work support 25 MPa (primary pressure)pressure of work clamp is reduced to 10 MPa.

Swing clamp(single acting clamp)

25MPa

Workpiece
25MPaWork support
25MPa

Swing clamp

Reducing valve
model VRG
Pages →162, 163(single acting clamp)
10MPa

Control unit
model HCT
Page →172

Control system

Coupling valve
model VHD
Pages →160, 161

Air

Reducing valve
model VRG

Coupling valve
model VHD

Hydraulic hose

Air

Pascal valve
Single acting clamp

Switchingvalve

Hydraulic coupler

Pascal pumpSingle acting clamp

Work support

Control unit model HCT

To download CAD data / To get updated information, visit www.pascaleng.co.jp

153

Control system

30MPa

SingleactingSequence valve model VEF
Pages →164, 165

Clamps are sequentially operated through same circuit.
(Example) ① After clamping operation of work clamp② Work support operation locked.

Link clamp(single acting clamp)①

Work support
Workpiece②
Link clamp

Sequence valve
model VEF

(single acting clamp)

Pages →164, 165①
Control unit
model HCD□H-S
Page →169

Control system

Coupling valve
model VHD

Air

Clamping pressure
detection L.S.

Coupling valve
model VHD
Switching valve
Hydraulic hose

Non-leak valve

Single acting clamp
Hydraulic coupler
Air

Sequence valve
model VEF
Single acting clamp

Line ﬁlter

Pascal pumpPressure indicatorWork support

Control unit model HCD□H-S
Clamping pressure detection L.S.

154

Control system

30MPa

Singleacting

Accumulator model WPC
Pages →166, 167

After hydraulic pressure source has been disengaged, circuit pressure fluctuation due to temperature changes is suppressed.

Swing clamp(single acting clamp)

Workpiece

Swing clamp(single acting clamp)

Accumulator
model WPC
Pages →166, 167

Control unit
model HCD□H-S
Page →169

Control system

Coupling valve
model VHD
Air

Two-way valve

Coupling valve
model VHD
Switching valve
Hydraulic hose

Single acting clamp

Non-leak valve

Hydraulic couplerAir‫ۃ‬
Line ﬁlter

Pascal pumpSingle acting clamp

Two-way valve

Accumulator
model WPC

Control unit model HCD□H-STo download CAD data / To get updated information, visit www.pascaleng.co.jp

155