• Series M
  • Cast Metal Pumps
  • Cast Iron & 316L Stainless Steel Air-Operated Diaphragm Pumps
Pipe Sizes
5-100 psi
Air Pressure
Pump Types

About Cast Metal Pumps

Cast metal pumps are used in paint, varnish, automobile, waste water, ceramic, porcelain, mining, building and chemical industries. More than 20 models with different sizes and designs are available to serve almost any type of application.

The sturdy cast metal construction ensures high abrasion resistance when pumping abrasive media, a low flow resistance due to the high surface finish, availability throughout a wide temperature range, excellent corrosion resistance, and a long lifetime. In combination with the well-established control system, these compact and powerful cast metal pumps are easy to transport and are therefore used as both mobile units or stationary equipment. During the development of the pumps, great attention was paid to service friendliness, in order to minimize downtime.

Due to the use of stainless steel clamp bands, these cast metal pumps are clearly distinguished from other air-operated diaphragm pumps. They can be easily disassembled without any special tools, and keep the diaphragms evenly clamped.

Special emphasis should be paid to the modular design, which leads to a reduction in the number of spare parts that must be stocked. Our cast metal pumps can be fitted with a vast variety of accessories, depending on the applications they are used for.

All cast metal pumps are standardly equipped with aluminum air center blocks. For industrial applications (as well as for other applications in which the environment or media is not suitable for aluminum), types CX and SX provide a center block in bronze or stainless steel.

Operating Principle & Model Information

Double-acting, positive displacement Series M pumps operate with two alternating pumping chambers. The compressed air which drives the unit is admitted through a control valve, to the rear of each diaphragm in turn, so displacing the medium from alternate pumping chambers. In the pump illustrated below, the right-hand pumping chamber is in the intake position. A vacuum has been created by the retraction of the diaphragm and the pumped medium flows into the chamber. The left-hand diaphragm, which is supported by compressed air, simultaneously displaces the medium present in this chamber. Since the two diaphragms are connected by a common piston rod, suction always occurs in one chamber whilst discharge is occurring in the other.

Operating Principle for Cast Metal Pumps
Model #Pipe
Available Pump Types
DL 251"AvailableAvailableAvailableAvailable
DL 401½"AvailableAvailableAvailableAvailable
DL 502"AvailableAvailableAvailableAvailable
DL 803"AvailableAvailableAvailableAvailable

Pump Dimensions, By Model

Model #Dimensions
DL 257.5"9.3"9.5"12.7"2.4"1.4"3.3"2.8"5.6"1.4"7.9"
DL 408.7"12.2"12.0"16.0"2.8"2.0"3.3"3.7"7.0"2.0"10.0"
DL 5011.0"16.2"16.3"21.3"3.5"2.6"4.1"4.9"9.6"2.6"13.4"
DL 8013.8"20.2"20.6"26.8"4.1"3.1"4.1"6.3"12.0"3.1"16.5"
Dimensions for Cast Metal Models