AHD AHS ahd-explosion_spare-parts

Almatec AHD and AHS Series AODD Pumps for High-Pressure Applications

Almatec® AHD and AHS Series Air-Operated Double-Diaphragm (AODD) Pumps have been specially designed to provide a safe operation in high-pressure applications up to 15 bar (218 psig). A typical application of these pumps is filter press feeding

AHD Series pumps utilize an internal pressure booster while featuring the well-known Almatec ring-tightening structure. The “D” in AHD stands for Duplex, which means the reinforcement of the drive pressure is more than 2:1 by the internal pressure boosting stage. The maximum drive pressure of 7 bar (100 psig) allows the AHD to build up discharge pressures up to 15 bar (218 psig). AHD Series pumps are available in three sizes (AHD 15, 25 and 40) with maximum capacities of 4, 10 and 20 m3 /h (17, 44 and 87 gpm).

The AHS Series pump, which does not include an internal pressure booster, features an extremely rugged housing making it suitable for higher discharge pressures. The “S” in AHS stands from Simplex, meaning the drive pressure is transferred to the medium in a ration of 1:1. This makes the AHS Series ideal for a wide variety of applications under heavy load conditions – from low discharge pressures to high-pressure applications up to 15 bar (218 psig). Due to the 1:1 ratio of the drive/discharge pressure, the corresponding air pressure has to be supplied from the compressor itself or an external pressure booster, also offered by Almatec. AHS pumps are available in two sizes (AHS 15 and 25).

Users who need a high discharge pressure of 15 bar (218 psig) – no matter whether it is with an AHD pump with internal pressure transmission or an AHS pump that achieves the discharge pressure by means of an external booster – can do so with peace of mind that the pump has been specially designed for such pressure ranges and does not have to be held together by external reinforcements.

Features at a Glance

  • Corrosion-proof and wear-resistant housing in solid design made of polyethylene for heavy-duty applications
  • Double-acting principle of operation
  • High pump safety due to innovative ring-tightening structure
  • Automatic pressure/volume adjustment for filter press feeding
  • No control or safety elements required for dry running, over pressure and speed control
  • Safe operation over the entire range of capacity without over pressure risk
  • No drives, rotating parts or shaft seals
  • Self-priming and dry run capable
  • Easy startup
  • Gentle displacement by compressible drive medium
  • Compact dimensions
  • Specially developed heavy-duty diaphragms for long service life
  • Integrated muffler
  • Horizontal or vertical position for suction and discharge ports
  • Maintenance-free PERSWING P® air control system without dead center

Related Pages and Products

Materials

Part Materials
Wetted Housing PE
Non-Wetted Center Block PA
Diaphragms EPDM, PTFE/EPDM, NBR
Ball Valves EPDM, PTFE, NBR

Technical Data

AHD Series AHS Series
Pump size AHD 15 AHD 25 AHD 40 AHS 15 AHS 25
Dimensions mm (in.) Width 312 (12.3) 422 (16.6) 539 (21.2) 266 (10.5) 336 (13.2)
Depth 177 (7.0) 256 (10.1) 291 (11.5) 177 (7.0) 256 (10.1)
Height 336 (13.2) 412 (16.2) 544 (21.4) 336 (13.2) 412 (16.2)
Flange connections DIN or ANSI 15 (1/2") 25 (1") 40 (1-1/2") 15 (1/2") 25 (1")
Air connection BSP 1/4" 1/2" 1/2" 1/4“ 1/4“
Weight kg (lb) 11 (24) 24 (53) 53 (117) 9 (20) 19 (42)
Max. particle size of solids mm (in.) 4 (0.16) 5 (0.20) 8 (0.31) 4 (0.16) 5 (0.20)
Suction lift, dry
– EPDM/NBR ball valves
– PTFE ball valves
 
mWC (ft)
 
2 (6.6)
1.5 (4.9)
 
3.5 (11.5)
2 (6.6)
 
3.5 (11.5)
2 (6.6)
 
2 (6.6)
1.5 (4.9)
 
2.5 (8.2)
1.5 (4.9)
Suction lift, wet mWC (ft) 9.5 (31.2) 9.5 (31.2) 9.5 (31.2) 9.5 (31.2) 9.5 (31.2)
Max. driving and operating pressure bar (psig) 7 (100) 7 (100) 7 (100) 15 (218) 15 (218)
Max. operating temperature °C (°F) 70 (158) 70 (158) 70 (158) 70 (158) 70 (158)
Max Capacities m³/h (gpm) 4 (17) 10 (44) 20 (87) 4 (17) 8 (35)

Code System

ahd-ahs-code

Performance

ahd15-chart
ahd25-chart
ahd40-chart
ahs15-chart
ahs25-chart
ahs25-booster-chart

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