standard pb300 series hydraulic power units · pb300 power pack catalogue savery hydraulics are...

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Standard PB300 Series Hydraulic power units

Product Guide

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2

PB300 POWER PACK CATALOGUE

SAVERY HYDRAULICS ARE LEADERS IN THE DESIGN AND MANUFACTURE OF HYDRAULIC SOLUTIONS RANGING FROM LARGE 1200 KW SYSTEMS, OFTEN CONTAINING CUTTING EDGE ELECTRO-HYDRAULIC CONTROLS, TO SMALLER COMPACT 0.55 KW UNITS SUCH AS THE PB300 SERIES.

Savery PB300 Series hydraulic power units are the culmination of many

years experience in manufacturing small AC and DC power packs. They

are constructed from standard modular components which are produced

in volume, therefore offering a flexible, cost effective unit which can be

matched to a very wide range of industries that utilise fluid power in

every day applications such as tail lifts, vehicle lifts, scissor lifts, tippers,

machine tools and medical equipment.

Numerous options and configurations of the standard

PB300 packs are available including E-Marking (please

contact sales department for further information)

PB300 Series power units consist of the following basic components:

A reservoir with 1.5 to 12 litres usable volume (steel or plastic)

An electric motor 12/24VDC up to 2.2kW 230VAC single phase

up to 2.2kW and 400VAC 3 phase up to 3kW

A high volumetric efficiency low noise gear pump 1.1cc/rev to

8.0cc/rev. Capable of pressures up to 250 bar

A manifold (centre adaptor) which can contain various valve

combinations

Savery is a member of the British Fluid Power Association and is certified by the BSI to ISO 9001:2008 and ISO 14001.

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3

Order Code 4-5

AC Motors 6-9

DC Motors 10-11

Circuit 12-14

Flow Control 15

Valve Type 16-17

Coil Voltage 18

Pump 19-21

Standard Relief Settings 22

Tanks 23-25

General Dimensions 26-29

Optional Extras 30

Useful Information 31

4

Ordering Codes

HOW TO ORDER.

Using the ordering codes below a PB300 power pack can easily be configured to suit your requirements. Simply work along each section choosing the configuration that you require. Each part of the order code is represented in the pages of this catalogue to help explain details further if required.

EXAMPLE 2

PB300-1211-CD-00-3C2-230-42-SV12-50

This would be a PB300 power pack with a 1.1kW 2 pole single phase (230V) electric motor using the double acting circuit. It would be fitted with a closed centred CETOP valve with 230 VAC coils, a 4.2cc/rev pump and a 12 litre capacity vertical steel tank. The relief valve would be set at 50 bar.

PB300 MOTOR TYPE AC

MOTOR TYPE DC

FLOW CONTROLCIRCUITOR

EXAMPLE 1

PB300-16-SS-04-20-12-16-PH6-140

This would be a PB300 power pack with a 1.6kW 12 VDC electric motor using the single acting circuit. It would be fitted with a 4 litre/min flow control valve, a normally closed poppet cartridge valve with a 12 VDC coil, a 1.6cc/rev pump and a 6 litre capacity horizontal plastic tank. The relief valve would be set at 140 bar.

SS

SD

CD

= 10 L/MIN 10

INCREASING IN 1.0 L/MIN INCREMENTS TO A MAXIMUM OF 10 L/MIN PLEASE REFER TO

THE TABLE ON PAGE 15

00

01

= NO FLOW CONTROL

= 1.0 L/MIN

5

EXAMPLE 3

PB300-1211-CD-00-3C2-230-42-SV12

This would be a PB300 power pack with a 1.1kW 2 pole single phase (230V) electric motor using the double acting circuit. It would be fitted with a closed centred CETOP valve with 230 VAC coils, a 4.2cc/rev pump and a 12 litre capacity vertical steel tank. The relief valve would be set at 40 bar.

5

RELIEF SETTING

COIL VOLTAGE PUMP TANKVALVE TYPE

40

200

INCREASING IN 10 BAR

INCREMENTS FROM 40 BAR

TO A MAXIMUM OF 200 BAR

Omit for standard setting see page 22

1.5 STEEL HORIZONTAL ONLY

2.5 STEEL HORIZONTAL ONLY

6

AC Motors Single Phase

Savery PB300 single phase 240VAC motors are specially manufactured in aluminium to fit directly onto Savery PB300 centre adaptors which eliminates the need for any special adaptor kits.

Single phase motors are available in a 2 pole version ranging from 0.75kW to 2.2kW and a 4 pole version ranging from 0.55kW up to 1.5kW. These motors are fitted with dual capacitors which provide high starting and running torque characteristics. The motors are totally enclosed, fan cooled, with IP55 protection and class F insulation. They are low noise, low vibration, high efficiency motors.

Single Phase Motor Information

CODE POWER POLES SPEED FRAME SIZE

1207 0.75kW

2

2800rpm MLd80

1211 1.1kW 2730rpm MLd80

1215 1.5kW 2835rpm MLd90

1222 2.2kW 2770rpm MLd90

1405 0.55kW

4

1390rpm MLd80

1407 0.75kW 1445rpm MLd80

1411 1.1kW 1415rpm MLd90

1415 1.5kW 1430rpm MLd90

Single Phase Motor Dimensions (mm)

FRAME SIZE

A D F F1 F2 L H H1 S W

MLd80 50

10

100 125 153 244 80 154

15 166

MLd90 56 125 140 174 286 90 164

P = Power (kW)

p = operating pressure (bar)

ntot = total output (0.9)

Q = flow (l/min)

pQ600=P

ntot

7

'F1''F2''W'

'S'

'F''A'

'H'

'H1'

'D'

'L'

7

8

AC Motors 3 Phase

A range of three phase, 400V +/-10% AC motors are available in 2 pole versions ranging from 0.75 kW to 3.0kW and 4 pole options from 0.55kW to 2.2kW which allows more flow rate options when deciding on pump selection.

The motors are totally enclosed, fan cooled, with IP55 protection and Class F insulation. They are low noise, low vibration, high efficiency motors.

As with our single phase motors, these robust aluminium framed motors are supplied with the Savery special mounting flange which fits directly on to the PB300 centre adaptor.

3 Phase Motor Information

CODE POWER POLES SPEED FRAME SIZE

3207 0.75kW

2

2840rpm WEA80

3211 1.1kW 2890rpm WEA80

3215 1.5kW 2890rpm WEA90S

3222 2.2kW 2890rpm WEA90L

3230 3.0kW 2890rpm ZWEA90L

3405 0.55kW

4

1365rpm WEA80

3407 0.75kW 1390rpm WEA80

3411 1.1kW 1435rpm WEA90S

3415 1.5kW 1430rpm WEA90L

3422 2.2kW 1430rpm ZWEA90L

3 Phase Motor Dimensions (mm)

FRAME SIZE

A D F F1 F2 L H H1 S W

WEA80 51

10

100

125 154 256 80 121

13

157

WEA90S 48

140 180

250

90

136

180WEA90L 56

125

274 137

ZWEA90L 63.5 291 139

9

'F2'

'H'

'H1'

'L'

'F1''S'

'F''A''D'

'W'

9

10

DC Motors

Savery PB300 DC brush motors are available in 1.6 kW; 12V and 2.2 kW; 24V versions and are rated for intermittent operation (see chart below).

Both motors have common overall external dimensions and fit directly on to the PB300 centre adaptor.

These motors can be supplied with an optional thermal switch if required. Please consult our sales team.

E-Marking is available on certain packs with DC motors, see page 26 for further details.

S2 Short-time operation

The motor operates only during a short period of time (e.g.10, 30 or 60 min) so that it may reach the highest permissible temperature during its operation; during its idle period it is thoroughly cooled to the ambient temperature.

S3 – Periodic operation

The operation of the motor is a continuous sequence of load periods and idle periods, so that it may reach the highest permissible temperature during operation, while during its idle period it does not cool to the ambient temperature. The relative on-time is expressed as percentage of the ratio between operation and once cycle time.

Main Technical Data1.6kW Motor

CODE 16

VOLTAGE 12V

POWER 1600W

CURRENT 230A

SPEED 2600RPM

DUTYS2=2.0 MIN

S3=7.5% ED

INSULATION F

PROTECTION DEGREE IP54

EXCITATION COMPOUND WOUND

WEIGHT 6.7 KG

Main Technical Data2.2kW Motor

CODE 22

VOLTAGE 24V

POWER 2200W

CURRENT 140A

SPEED 2600RPM

DUTYS2=1.2MIN

S3=4.5% ED

INSULATION F

PROTECTION DEGREE IP54

EXCITATION COMPOUND WOUND

WEIGHT 6.7 KG

12

Circuits

An important step towards configurating your hydraulic power pack is to select the right circuit for your application. Refer to the following standard screw in cartridge valve and CETOP 3 circuit options.

The single acting circuit will raise a load under pressure. When the load needs to be lowered the solenoid would be operated to release the hydraulic fluid back to the tank. If a specified rate of descent is required then a flow control valve can be fitted.

General features of the single acting circuit are:

Solenoid operated (poppet type) see page 16

Relief Valve

Check Valve

Optional Flow Control Valve

Port ‘A’ - 3/8” BSP.

195

APPR

OX

40

119

22

18.5

PORT 'A'

21 95

2 MTG HOLESM10 x 14 F.T.L.

SS - Single Acting Solenoid Cartridge

See page 16 for spool options

OptionalFlowcontrol

13

With a double acting circuit to raise a load the solenoid would be switched into the correct position to direct the hydraulic fluid to the correct port of the cylinder. When the load needs to be lowered the solenoid would be switched in the opposite direction to reverse the hydraulic connection.

General features of the double acting circuit are:

Solenoid operated (spool type) see page 17

Relief Valve

Check Valve

Port ‘A’ - 1/4" BSP

Port ‘B’ - 3/8" BSP

18.5

40

136

232

APPR

OX

(195

APP

RO

X W

ITH

VALV

E CO

DE

40)

85

119

22

9521

PORT 'B'

PORT 'A'



SD - Double Acting Solenoid Cartridge

13

OptionalFlowcontrol

14

Circuits cont...

With a double acting CETOP circuit to raise a load the CETOP valve would be switched into the correct position to direct the hydraulic fluid to the correct port of the cylinder. When the load needs to be lowered the CETOP valve would be switched in the opposite direction to reverse the hydraulic connection.

General features of the single acting circuit are:

CETOP operated, see page 17

Relief Valve

Check Valve

Ports ‘A’ & ‘B’ - 3/8” BSP

Note: Port ‘A’ is dimensional opposite to Port ‘B’

CETOP 3 options can serve more than one actuator and can incorporate multi functions by stacking modular control valves. Please contact our sales team for further advice.

18.5

40

37

'A'

'B'

136

'C'

216

21 95


DIM DC MOTOR AC MOTOR

‘A’ 185 228

‘B’ 161 199

‘C’ n/a 25


CD - Double Acting CETOP

15

Flow Control

CODE CONTROLLED RATE

00 No Flow Control

01 1.0 l/min

02 2.0 l/min

03 3.0 l/min

04 4.0 l/min

05 5.0 l/min

06 6.0 l/min

07 7.0 l/min

08 8.0 l/min

09 9.0 l/min

10 10.0 l/min

If a controlled rate of descent is required when lowering a load then a pressure compensated flow control valve (available flow rates shown) can be fitted underneath the screw in cartridge valve in single acting applications only.

15

16

Valve Type

The single or double acting circuit is further defined by selecting the correct valve configuration for your application from the options shown on the following pages.

E-Marking is available on certain packs, but only with cartridge valves. See page 26 for further details.

All single acting solenoids are fitted with a 150 micron filter as standard.

E11

Normally ClosedCode - 20

Normally OpenCode - 21

Single Acting Solenoid Valve

17

Double Acting Solenoid Valve

Double Acting CETOP Valve

Change OverCode - 40

Change OverCode - 2B2

Closed CentreCode - 47C

Closed CentreCode - 3C2

Tandem CentreCode - 47A

Change OverCode - 3C60

Motor SpoolCode - 47D

Motor SpoolCode - 3C4

17

18

Coil Voltage

All AC coils are internally rectified, and can be used in 50 or 60 cycle (Hz) lines. AC voltage service with transient surges over 1000 volts may require that a varistor be placed in parallel at the coil, please consult sales team for further information.

Dimensions for the standard coils fitted to cartridge valves are shown below.

CODE MOTOR TYPE

12 12V DC

24 24V DC

24A 24V AC (AC motors only)



Coils that are fitted to the standard range of PB300 power packs all use a DIN 45360 type of connection and are fitted with a Hirschmann plug. The following coil voltages are available as standard:

Other connection options are available, if you require a different type of connection then please contact our sales team.

19

Pumps

The heart of the system – PB300 gear pumps are manufactured from a combination of machined lightweight aluminium housings with precision ground gear sets and long wearing pressure balanced thrust plates.

19

Pumps are rated up to 200 bar continuous and 250 bar peak pressures.

Pump flow rates (lpm) are normally determined by the pump displacement (cc/rev.) at a given pump shaft rotational speed (rpm).

For AC motor applications use the following formula

For DC motor applications use the pump curves shown on pages 20 & 21.

This is for S1 continuous rating of the electric

motor, (S1 being where the motor operates

at constant load of sucient duration to reach

the nal thermal equilibrium which does not

exceed the highest permissible temperature.)

For intermittent operation higher loading are

permitted (please consult the sales department).

P = Power (kW)

p = operating pressure (bar)

ntot = total output (0.9)

Q = flow (l/min)

pQ600=P

ntot

CODE PUMP DISPLACEMENT

11 1.1cc

13 1.3cc

16 1.6cc

18 1.8cc

21 2.1cc

27 2.7cc

32 3.2cc

37 3.7cc

42 4.2cc

48 4.8cc

58 5.8cc

80 8.0cc

20

Pumps continued

Pump Curves 12V 1.6kW Motor

21

18

15

12

9

6

3

0

350

300

250

200

150

100

50

00 50 100 150 200 250

21

18

15

12

9

6

3

0

350

300

250

200

150

100

50

00 50 100 150 200 250

1.1cc to 2.7cc Pumps

FLO

W (

L/m

in)

(sol

id L

ines

)FL

OW

(L/

min

)(s

olid

Lin

es)

PRESSURE (bar)

PRESSURE (bar)

CU

RR

ENT

(am

ps)

(dot

ted

lines

)C

UR

REN

T (

amps

)(d

otte

d lin

es)


1.1cc 1.3cc 1.6cc 1.8cc 2.1cc 2.7cc

3.2cc 3.7cc 4.2cc 4.8cc 5.8cc 8.0cc

21

18

15

12

9

6

3

0

350

300

250

200

150

100

50

00 50 100 150 200 250

21

Pump Curves 24V 2.2kW Motor

21

18

15

12

9

6

3

0

240

210

180

150

120

90

60

30

00 50 100 150 200 250

21

18

15

12

9

6

3

0

240

210

180

150

120

90

60

30

00 50 100 150 200 250

21

18

15

12

9

6

3

0

240

210

180

150

120

90

60

30

00 50 100 150 200 250


FLO

W (

L/m

in)

(sol

id L

ines

)FL

OW

(L/

min

)(s

olid

Lin

es)

PRESSURE (bar)

PRESSURE (bar)

CU

RR

ENT

(am

ps)

(dot

ted

lines

)C

UR

REN

T (

amps

)(d

otte

d lin

es)


1.1cc 1.3cc 1.6cc 1.8cc 2.1cc 2.7cc

3.2cc 3.7cc 4.2cc 4.8cc 5.8cc 8.0cc

21

21

18

15

12

9

6

3

0

240

210

180

150

120

90

60

30

00 50 100 150 200 250

22

Standard Relief Settings

All Savery PB300 power packs are fitted with an adjustable relief valve that can be set at requested pressures from 40 to 200 bar in 10 bar increments. If no pressure is requested then the relief will be set at a standard setting stated in the tables below.

The relief fitted to the power packs are a poppet style designed for a low leakage and are quiet in operation.

PUMP CC0.55kW 0.75kW 1.1kW 1.5kW 2.2kW 3.0kW

2 POLE 4 POLE 2 POLE 4 POLE 2 POLE 4 POLE 2 POLE 4 POLE 2 POLE 4 POLE 2 POLE 4 POLE

1.1 - 160 110 170 160 170 170 170 170 170 170 -

1.3 - 140 90 170 135 170 170 170 170 170 170 -

1.6 - 110 75 150 110 170 150 170 170 170 170 -

1.8 - 100 70 130 100 170 135 170 170 170 170 -

2.1 - 80 60 115 85 165 115 170 170 170 170 -

2.7 - 65 45 90 65 130 90 170 130 170 170 -

3.2 - 30 40 75 55 110 75 150 110 170 150 -

3.7 - 50 - 65 50 95 65 130 95 170 130 -

4.2 - 40 - 55 40 80 60 115 85 165 115 -

4.8 - - - 50 40 75 50 100 75 145 100 -

5.8 - - - 40 - 60 40 80 60 120 80 -

8 - - - - - 45 - 60 45 90 60 -

PUMP CC 12V1.6kW 24V2.2kW

1.1 170 170

1.3 170 170

1.6 170 170

1.8 170 170

2.1 170 170

2.7 150 170

3.2 125 170

3.7 110 150

4.2 100 130

4.8 85 115

5.8 70 95

8 50 70

Standard relief settings (Bar) for AC power packs

Standard relief settings (Bar) for DC power packs

23

Tanks - Plastic

23

Horizontal Vertical

CODE VOLUME LENGTH ‘L’ CODE VOLUME

PH4 4 litres 200.00 mm PV4 4 litres




The tank or fluid reservoir is a storage vessel which can accommodate changes in the volume of the fluid in the hydraulic circuit and to provide a surface area which allows cooling. The tank also provides a filling point for the system.

Savery high quality plastic tanks are manufactured by using an advanced combination of injection moulding and welding technologies which result in a tough impact and corrosion resistant product with a clear oil level sight and rugged construction.

LENGTH 'L'180

180200

n120

FILLER POSITION ON VERTICAL TANK

PLUG POSITION ON HORIZONTAL TANK

PLUG POSITION ON VERTICAL TANK

FILLER POSITION ON HORIZONTAL TANK

6

3

4 SLOTS ON

n143 P.C.D.

24

Tanks - Steel

The PB300 steel tank consists of a cylindrical shell manufactured from deep drawn steel which is welded to a Savery standard rolled steel tank neck and mounting flange.

Each tank has a black gloss painted finish and comes complete with a filler breather, plated steel drain plug and metallic particle magnet.

Horizontal Vertical

CODE VOLUME LENGTH ‘L’ CODE VOLUME

SH1 1.5 litres 160.00 mm - -

SH2 2.5 litres 211.00 mm - -

SH4 4 litres 225.00 mm SV4 4 litres




25

Available in 1.5 & 2.5 litres (horizontal orientation only)

n178

LENGTH 'L'4 OFF SLOTS ON

Ø143.00 P.C.D.

n120

7

2

PLUG POSITION ON VERTICAL TANK

FILLER POSITION ON HORIZONTAL TANK

FILLER POSIOTION ON VERTICAL TANK

PLUG POSITION ON HORIZONTAL TANK

25

Available in 4, 6, 8 & 12 litres only

26

General Dimensions AC Packs

TANK CODE ‘A’

P*4 200

P*6 335

P*8 440

P*12 550

SH1 160

SH2 211

S*4 225

S*6 290

S*8 365

S*12 545

MOTOR CODE MOTOR FRAME ‘B’ ‘H’ ‘H1’ ‘W’ ‘H2’

SS SD CD SS SD CD

1205, 1207, 1407, 1411 MLD80 244 80 154

180 180

262 234 245 228

1211, 1215, 1415, 1422 MLD90 286 90 164 256 254 255 238

3207, 3211, 3405, 3407 WEA80 256 80 121 229 214 245 228

3215, 3411 WEA90S 250

90

136 244 226

255 2383222, 3415 WEA90L 274 137 245 227

3230, 3422 ZWEA90L 291 139 247 229

‘A’ – Tank length.‘B’ – Motor length.‘H’ – Motor centre to mounting surface.‘H1’ – Motor centre to top of valve.‘H2’ – Maximum height.‘W’ – Maximum width.*Designates Vertical (V) or Horizontal (H) pack. Tank codes SH1 and SH2 are not available as a vertical option.

'A' 40 'B'

'L' = A+B+40

'H2'

'W'

'H'

'H1'

Single phase motor used for illustration purposes only

Single Acting Solenoid Packs (SS)

27

'B'

'H2'

'L' = A+B+40

'A' 40

165

'H1'

'H'

'W'

**Please note that the motor is rotated through 90° when a CETOP valve is required

3 phase motor used for illustration purposes only

Single phase motor used for illustration purposes only

27

Double Acting Solenoid Packs (SD)

CETOP Packs (CD)**

'H2'

'L' = A+B+40

'A' 40

'H'

'W'

'B''H1'

28

General Dimensions DC Packs

TANK CODE ‘A’

P*4 200

P*6 335

P*8 440

P*12 550

SH1 160

SH2 211

S*4 225

S*6 290

S*8 365

S*12 545

PACK CODE ‘B’ ‘H’ ‘H1’ ‘W’ ‘H2’

SS

174 67

128

180

210

SD 165 232

CD 118 230 202

‘A’ – Tank length.

‘B’ – Motor length.

‘H’ – Motor centre to mounting surface.

‘H1’ – Motor centre to top of valve.

‘H2’ – Maximum height.

‘W’ – Maximum width.

*Designates Vertical (V) or Horizontal (H) pack.

Tank codes SH1 and SH2 are not available as a vertical option.

'A' 40 'B'

'L' = A+B+40

'H2

'

'H'

'H1

'

'W'

Single Acting Solenoid Packs (SS)

29

'H'

'H1

'

40'A'

'L' = A+B+40

'H2

'

'W'

'B'

'A' 40

40'A'

'L' = A+B+40 'W'

'H2'

'B'

'L' = A+B+40

'B'

'H'

'H1

'

'W'

**Please note that the motor is rotated through 90° when a CETOP valve is required

29

Double Acting Solenoid Packs (SD)

CETOP Packs (CD)**

30

Optional Extras

Motor Cover

E-Marking

Hand Pump

Mounting Foot

A motor cover is available on all DC power packs. It covers the motor and the starter and offers protection against the elements.

Demand for E-Marking on machinery is ever increasing and this can be provided on our PB300 series with DC motors as an optional extra when using screw in cartridge valves.

Fits in size 08-2 way standard industry cavity and has a capacity of 4.0cc stroke.

An emergency lift hand pump can be fitted to the SS & CD circuit options of the PB300 power packs.

An additional mounting foot is available for all PB300 power packs. This provides a different option for mounting the power pack.

10R-04 7834E11

31

Useful Information

FLUIDSTYPE – Hydraulic mineral oil (consult sales department for use with fire resistant or other types of oil.

VISCOSITY – The correct grade of oil depends on the applications, duty cycle and ambient temperature. The following table provides general guidance.

USEFUL FORMULAE

ELECTRICAL WIRINGIt is essential that units are wired to give the correct rotation of the electric motor, anti-clockwise when viewed from the rear fan end of the motor. Wiring should also be in accordance with the electric motor/control system requirements and fully in compliance with the relevant electrical regulations.

RESERVOIRS AND OPERATING TEMPERATURESThe oil reservoir should be sized to ensure the pump suction is always covered. Oil reservoir capacities stated in this catalogue are useable. For intermittent rated applications a guide to reservoir capacity is as follows.

AMBIENT TEMPERATURE

°C

ISO VISCOSITY GRADE VG NUMBER

VISCOSITY INDEX

Standard grade oils

-5 to 25 32 98

5 to 35 46 98

Premium grade oils with higher viscosity index

-10 to 30 37 156

-25 to 35 22/32 403

TOTAL SYSTEM DISPLACEMENT MINIMUM RESERVOIR CAPACITY

Less than 10 litresSystem displacement

+30% to 75%

Above 10 litres System displacement +25% to 50%

For arduous or semi-continuous applications the foregoing should be considered as the absolute minimum, and the reservoir should be sized to ensure the maximum fluid working temperature does not exceed 60°C PB300 units are designed to operate between -15°C ambient to 40°C fluid.

FILTRATIONAll units are fitted with 125 micron pump suction filters, and single acting units with solenoid operated lowering valves have a 150 micron filter fitted.

POWER kWkW = pQ 600 ntot Q = Flow (litres/min) 1 kW = 1.34 H.P.p = Pressure (bar)ntot = total output (0.9)

CYLINDER DISPLACEMENT/FLOW RATESImperial Units (in2) Metric Units (cm2)Cylinder Area = �d2 Cylinder Area = �d2 4 4d = cylinder bore (inches) d = cylinder bore (cm)� = 3.142 � = 3.142

COOLINGHydraulic reservoirs cool the oil through radiation and convection. There are many factors which will affect the cooling, the following is intended as a guide only and should be qualified by testing on application.

1. Estimate the heat input in kW on an intermittent duty rated power unit F x T x H = P60 x 60F = Frequency of heat input in cycles/hour (spaced over 1 hour)T = Duration of the heat input in secondsH = Heat input in KwP = Average heat to be dissipated in Kw

EXAMPLEHydraulic lift doing 10 cycles/hour with a heat input of 1kW for 60 seconds duration in each cycle

F x T x H = P 10 x 60 x 1 = 0.17Kw 60 x 60 60 x 60

EXAMPLEFrom foregoing example power to be dissipated is 0.17kW. Using code PV12 reservoir surface area = 0.25 m2 in a normally ventilated space.�T = 0.17 x 1000 = 57 °C temperature rise 0.25 x 12Therefore if operating in a 20°C ambient temperature, oil temperature would be 20 +57 =77 °C

2. Calculate the oil temperature rise�T = P x 1000 A x k�T = Temperature rise in °CP = Power to be dissipated in KwA = Surface area of the tank (excluding base) in m2

k = heating coefficient in W/m2 °C k = 12 (normally ventilated space) k = 6 (Poor ventilation) k = 24 (Forced ventilation)

Cylinder Displacement (in3) Cylinder Displacement (cm3) = A x L = A x L 277.4 1000

A = Cylinder area in2 A = Cylinder area cm2

L = Cylinder Stroke in L = Cylinder Stroke cm

Cylinder Flow (gall/min) = 60 x D Cylinder Flow (litres/min) = 60 x D T T

T = Time in seconds T = Time in secondsD = Displacement in gallons D = Displacement in litres

FORCE AND PRESSURE1 lb = 0.454 Kg 1 Bar = 14.5 lb/in2

1 Kg = 2.205 lb 1kgf = 9.81 Newton

CYLINDER THRUSTImperial Units Metric UnitsF = P x A F = (P x A) x 10F = Force in lb F = Force in Newtons A = Cylinder Area in in2 A = Cylinder Area cm2

VOLUME1 Litre = 0.22 Imperial Gallons = 0.264 US Gallons1 Imperial gallon = 277.4 in3

1 US gallon = 230 in3

1 in3 = 16.39 cm3

31

T A Savery & Co Limited Grovelands Longford Road Exhall Coventry CV7 9NE

T. +44 (0)24 7664 5555 F. +44 (0)24 7636 6879

E. [email protected]

savery.co.uk

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PPB Issue 1 – April 2016

E11

standard pb300 series hydraulic power units · pb300 power pack catalogue savery hydraulics are...

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