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Super quiet Calma® gear pump

Calma WP900 series, group II, hydraulic gear pump

The Calma pump, is designed to be used as a single unit or as an element within multiple hydraulic assemblies. The modular philosophy means that standard housings can easily be varied to incorporate different functions and different internal connections.
Calma® low noise gear pump
Comparison of standard gear pump to Calma double flank engagement setup gear pump.
Setting a new standard for noise reduction on hydraulic pumps. Developed on the principle for double flank engagement, already known from WQ900.

Designed for applications where low noise and/or low pressure pulsation is required, eg Electric Counterbalance Forklift Trucks, Reach Trucks, etc.

Outside dimensions are equal to WQ900.

Design code ”L” version available for improved performance and durability at noise reduction at low rpm.
Operating pressure P2 - max. 20 sec loaded following 10 sec minimum unloaded. Minimum speed is valid for CALMA pump series with optional Low speed feature (Design code ”L”).

Low speed feature (Design code ”L”):
At 400 RPM and operating pressure 250 bar - max. 2,5 sec load duration.
Reduced operating pressure results in longer load duration (>2,5 sec).

Min. viscosity range: min. 10 mm2 /s.
Calma super quiet gear pump data table

Haldex launches quietest hydraulic pump for vehicles

The pump, designated CALMA, features a newly engineered tooth geometry, innovative true dual-flank gear engagement, reduced trapped oil volume and advanced trapped oil management. The design reduces pressure pulsation by 75%, which is the key factor determining the pump's noise levels, while also reducing energy consumption.

In the market for electric and gas-powered vehicles, low noise is a key requirement, while low-speed operation enables improved control and positioning for various vehicle functions. Consequently, gear pumps that can operate efficiently and quietly at low speeds are now among the most important priorities for electric vehicle designers. The trend towards lower noise standards, which has been further encouraged by legislation in Europe and elsewhere, also applies to other markets including truck, bus and off-highway, where CALMA is also expected to find many applications.

Apart from its low noise benefits, the CALMA pump offers important energy-saving advantages. Considerable excess hydraulic flow is generated in maneuvring the vehicle and this energy is normally dumped via valves, creating waste heat and a premature drain on battery power. CALMA's adjustable and low-speed capability avoid unnecessary power drain and further increase battery life.

Both static and in-vehicle tests have demonstrated that CALMA series pumps offer significantly lower noise operation when compared with other external gear pumps. In many cases, they can also match or even out-perform more expensive internal gear pumps on efficiency and low-noise operation. CALMA is especially well suited to applications on electric counterbalanced lift trucks and warehouse lift trucks.

Sound power testing in comparison with other quiet gear pumps on these vehicles showed CALMA provided significant reductions in noise during the steer, tilt and lift functions by 50% to 85%. CALMA is also well suited to electric aerial work platforms and other mobile equipment where low noise, low speed and high efficiency are required.

Following an exhaustive program of research and development in collaboration with the University of Dresden, Haldex Hydraulics has introduced a range of CALMA pumps in displacements from 6.2 cc to 23.7 cc. The company is a specialist in hydraulic gear product technology and established itself as a leader in low-noise gear products a decade ago when it introduced the first WQ series (quiet) gear pump product line. This introduced the concept of true dual flank engagement of the gear teeth (as opposed to “almost dual flank engagement”), which is unique to Haldex and which reduces the amplitude of the pressure pulsations introduced into the hydraulic system.

Like other products in the Haldex range, the new CALMA pump is designed to be used as a single unit or as an element within multiple hydraulic assemblies. The modular philosophy common to the Haldex range means that standard housings can easily be varied to incorporate different functions and different internal connections. The modular approach also helps to ensure the very exacting production standards required to deliver market-leading technologies cost-efficiently.

See the report by Justin Cunningham of Eureka Magazine.
W900
Gear Pump
GROUP II
WM900
Gear Motor
GROUP II
WP900 CALMA
Gear Pump
GROUP II
WP900 FERRA
Gear Pump
GROUP II
WP900D
Gear Pump
GROUP II
WQ900 Super Quiet
Low Pulsation Gear Pump
GROUP II

Hydraulic Gear Pumps, Gear Motors,
Flow dividers and Power Packs

jbj Techniques Limited are the UK distributor for CONCENTRIC
Innovation in flow control and fluid power.

Concentric (formerly Haldex hydraulics)
A range of high quality gear pumps to suit a variety of applications. Concentric AB is the former Hydraulics Division of Haldex AB and from 16 June 2011, a separate listed company.
Link to » List of Concentric pumps and motor types
Concentric is an innovator in vehicle technology and supplies proprietary systems and components for trucks, cars and industrial vehicles worldwide.

Concentric Hydraulics is one of the world’s leading manufacturers of hydraulic pumps. In recent years Concentric have focused on important markets, such as materials handling and vehicles, which has resulted in a series of high performance hydraulic pumps.
These high pressure gear pumps are optimized for demanding work, with harsh weather conditions, rugged operations and long service intervals. The range of cost-efficient group I, II and III pumps for all applications in which the customer’s demands for quality and reliability are particularly high.

The Concentric company operates globally and enjoys global advantages: secure supply lines, close contact with customers on development and a universal technical platform that will always fit your product.

jbj Techniques Ltd provide a diverse range of mechanical drive & transmission solutions to industrial markets including design engineering, product supply and after sales service.

An experienced and dedicated team of technical sales engineers are on hand to work with customers and deliver results.
The markets where jbj operate are tough and time sensitive. In such circumstances customers need reliable solution partners, people who are conscious of deadlines, innovative in design and always willing to seek the best solution for the customers' needs.

On all counts, jbj Techniques Limited deliver. From specification, through technical advice, manufacture and support, together with our extensive product database including Concentric components, jbj Techniques provide a comprehensive and valued service to the power transmission and hydraulic industries.

Cast Iron Pumps
Heavy Duty

GC Series Pumps
Displacements
1.06 to 11.65 cc

GC Series High/Low Pumps
High Pressure Displacements
1.06 to 4.22 cc
Low Pressure Displacements
4.22 to 12.71 cc
Maximum Pressure
276 bar
Maximum Speed
4,000 rpm
F12 & F15 Ferra Series Pumps

F12 Displacements
16 – 41 cc

F15 Displacements
19 to 50 cc

Maximum Pressure
276 bar
Maximum Speed
3,600 rpm
F20 & F30 and F20LS/F30LS Load Sense Ferra Series Pumps

Displacements
23 to 161 cc
Maximum Pressure
276 bar
Maximum Speed
3,600 rpm
D Series Pumps
Displacements
3.80 to 22.85 cc

D Series High/Low Pumps
High Pressure Displacements
7.62 cc
Low Pressure Displacements
15.24 to 22.86cc
Maximum Pressure
207 to 276 bar
Maximum Speed
3,600 to 4,000 rpm

Aluminium Pumps
Medium / Light Duty

W Series Pumps
W100 Pumps
Displacements
0.50 to 2.00 cc
W300 Pumps
Displacements
0.80 to 5.70 cc
W600 Pumps
Displacements
4 to 12 cc
W900 Pumps
Displacements
5 to 31 cc
W1200 Pumps
Displacements
25 to 33 cc
W1500 Pumps
Displacements
19 to 50 cc
Maximum Pressure
276 bar
Maximum Speed
500 to 4,000 rpm
WK900 Calma Pumps
Displacements

5 to 27 cc
Maximum Pressure
230 bar
Maximum Speed
4,000 rpm

Hydraulic Motors

Cast Iron
Displacements
106 to 161 cc
Speed
up to 10,000 rpm

Aluminium
Displacements

4 to 50cc
Speed
up to 4,000 rpm

Flow Dividers

GC & D Series High/Low Pumps
GC Displacements
1.58 to 8.47 cc
D Displacements
3.8 to 13.32 cc
Maximum Pressure
310 bar
Maximum Flow per Input Section
53 litres per minute

Power Packs

Pump/Motors (DC/AC)
DC Voltage Range
12 to 72 VDC
AC Power Range
0.367749 to 2.2065 kW
Pump Displacements
0.65 to 28 cc
Maximum Pressure
276 bar
HB800 Power Packs 
Voltage Range
12 to 24 VDC
Pump Displacements
0.65 to 1.5 cc
Reservoirs
0.5 to 3.8 litres plastic
Maximum Pressure
180 bar
HE1000 Series Power Packs 
Voltage Range
12 to 24 VDC
Pump Displacements
0.24 to 2 cc
Reservoirs
0.5 to 3.8 litres plastic
Maximum Pressure
230 bar
HE2000 Series Power Packs 
Voltage Range
12 to 24 VDC, 115 to 230 VAC
Pump Displacements
0.80 to 6.36 cc
Reservoirs
0.9 to 15 litres steel,
0.76 to 1.6 litres plastic
Maximum Pressure
230 bar
HE 'Box' Power Packs 
Voltage Range
12 to 72 VDC
Pump Displacements
0.80 to 6.36 cc
Maximum Pressure
230 bar
Reservoirs
32.84 to 19 litres steel
HE-Q (Quiet) Power Packs 
Voltage Range
24 DC
WQ300 Pump Displacements
1.2 to 5.7 cc
Noise
42 dB(A)
Bi-rotational Power Packs
Voltage Range
12 to 24 VDC, 115 to 230 VAC
Pump Displacements
0.80 to 2.11 cc
Reservoirs
1.9 to 2.8 litres plastic,
3.8 to 7.6 litres steel
AC Power Packs GC-9500 Series
Displacements
1.06 to 22.85 cc
Maximum Pressure
207 bar
Maximum Speed
3,600 rpm
Reservoirs
19 to 76 litres steel

Cast Iron Pumps
Heavy Duty

GC Series Pumps
Displacements
1.06 to 11.65 cc

GC Series High/Low Pumps
High Pressure Displacements
1.06 to 4.22 cc
Low Pressure Displacements
4.22 to 12.71 cc
Maximum Pressure
276 bar
Maximum Speed
4,000 rpm
F12 & F15 Ferra Series Pumps

F12 Displacements
16 – 41 cc

F15 Displacements
19 to 50 cc

Maximum Pressure
276 bar
Maximum Speed
3,600 rpm
F20 & F30 and F20LS/F30LS Load Sense Ferra Series Pumps

Displacements
23 to 161 cc
Maximum Pressure
276 bar
Maximum Speed
3,600 rpm
D Series Pumps
Displacements
3.80 to 22.85 cc

D Series High/Low Pumps
High Pressure Displacements
7.62 cc
Low Pressure Displacements
15.24 to 22.86cc
Maximum Pressure
207 to 276 bar
Maximum Speed
3,600 to 4,000 rpm

Aluminium Pumps
Medium / Light Duty

W Series Pumps
W100 Pumps
Displacements
0.50 to 2.00 cc
W300 Pumps
Displacements
0.80 to 5.70 cc
W600 Pumps
Displacements
4 to 12 cc
W900 Pumps
Displacements
5 to 31 cc
W1200 Pumps
Displacements
25 to 33 cc
W1500 Pumps
Displacements
19 to 50 cc
Maximum Pressure
276 bar
Maximum Speed
500 to 4,000 rpm
WK900 Calma Pumps
Displacements

5 to 27 cc
Maximum Pressure
230 bar
Maximum Speed
4,000 rpm

Hydraulic Motors

Cast Iron
Displacements
106 to 161 cc
Speed
up to 10,000 rpm

Aluminium
Displacements

4 to 50cc
Speed
up to 4,000 rpm

Flow Dividers

GC & D Series High/Low Pumps
GC Displacements
1.58 to 8.47 cc
D Displacements
3.8 to 13.32 cc
Maximum Pressure
310 bar
Maximum Flow per Input Section
53 litres per minute

Power Packs

Pump/Motors (DC/AC)
DC Voltage Range
12 to 72 VDC
AC Power Range
0.367749 to 2.2065 kW
Pump Displacements
0.65 to 28 cc
Maximum Pressure
276 bar
HB800 Power Packs 
Voltage Range
12 to 24 VDC
Pump Displacements
0.65 to 1.5 cc
Reservoirs
0.5 to 3.8 litres plastic
Maximum Pressure
180 bar
HE1000 Series Power Packs 
Voltage Range
12 to 24 VDC
Pump Displacements
0.24 to 2 cc
Reservoirs
0.5 to 3.8 litres plastic
Maximum Pressure
230 bar
HE2000 Series Power Packs 
Voltage Range
12 to 24 VDC, 115 to 230 VAC
Pump Displacements
0.80 to 6.36 cc
Reservoirs
0.9 to 15 litres steel,
0.76 to 1.6 litres plastic
Maximum Pressure
230 bar
HE 'Box' Power Packs 
Voltage Range
12 to 72 VDC
Pump Displacements
0.80 to 6.36 cc
Maximum Pressure
230 bar
Reservoirs
32.84 to 19 litres steel
HE-Q (Quiet) Power Packs 
Voltage Range
24 DC
WQ300 Pump Displacements
1.2 to 5.7 cc
Noise
42 dB(A)
Bi-rotational Power Packs
Voltage Range
12 to 24 VDC, 115 to 230 VAC
Pump Displacements
0.80 to 2.11 cc
Reservoirs
1.9 to 2.8 litres plastic,
3.8 to 7.6 litres steel
AC Power Packs GC-9500 Series
Displacements
1.06 to 22.85 cc
Maximum Pressure
207 bar
Maximum Speed
3,600 rpm
Reservoirs
19 to 76 litres steel
Specification of Concentric gear pumps and motors found in this on-line » library « link
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