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AHD/AHS – AODD pumps

Almatec® AHD and AHS Series Air-Operated Double-Diaphragm Pumps have been specially designed for the safe operation of high-pressure applications up to 15 bar (218 psig).

AHD high-pressure pumps come equipped with an internal pressure booster. With a maximum drive pressure of 7 bar (100 psig), they can build up discharge pressures up to 15 bar (218 psig). 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. AHD Series pumps are available in three sizes (AHD 15, 25 and 40) with maximum capacities of 4, 10 und 20 m³/h (17, 44 and 87 gpm). A typical application of these pumps includes filter press feeding.

Available in two sizes (AHS 15 and 25), AHS Series pumps do not include an internal pressure booster.

The extremely rugged construction of the pump makes it suitable for higher discharge pressures. The maximum driving and discharge pressure is 15 bar (218 psig). This makes the AHS Series an ideal solution for every application under heavy load conditions, from low discharge pressures variable to high pressure applications.

The “S” in AHS stands for Simplex, meaning the drive pressure is transferred to the medium in a ratio of 1:1. 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.

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.

Further features of series AH at a glance:

  • Corrosion-proof and wear-resistant housing in solid design made of polyethylene

  • Double-acting principle of operation

  • Increased 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, no rotating parts, no shaft seals

  • Dry running capabilities

  • Self-priming

  • Easy start-up

  • Gentle displacement by compressible drive medium

  • Compact dimensions

  • Specially developed heavy-duty diaphragms for longer service life

  • Horizontal or vertical position for suction and discharge ports, flange connections DIN and ANSI

  • Replaceable ball valves and ball retainers

  • Maintenance-free PERSWING P® air control system without dead center

  • Special equipment meeting requirements (booster for AHS, diaphragm monitoring, stroke counting)​

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