CHAPTER I - GENERAL

2. Application - The Model MBG Diaphragm Pumps

CHAPTER I - GENERAL

are utilized for dewatering jobs where the liquid

carries a high percentage of trash, mud or sand, or

1. Description - The REX Model MBG Diaphragm

where there is a variable seepage of water, such as

Pump is a positive displacement type pump

in trench work.

(FSN2805-0724871) air cooled engine. The pump

Where slow water seepage and high suction lift is

and engine are mounted on a common frame and is

encountered, the use of a foot valve at the end of

trailer mounted. 4" inlet and outlet valves are bolted

the suction line is recommended. This addition will

to the pump body to which the suction and

facilitate priming and help maintain a dry excavatior.

discharge lines are fitted. (Engine maintenance and

(A foot valve is a flap type valve which opens with

parts are covered in TM 5-2805- 257-14).

the suction stroke of the pump and closes with the

discharge stroke, thus the suction line is always full

The main operating part of the pump is its flexible

of water after the suction line is filled.)

rubber diaphragm.

The outer edge of the

diaphragm is secured to the rim of the pump body.

CAUTION: A strainer must be used on suction

A connecting rod fastened to the diaphragm center

hose to prevent entrance of stones into the

moves it up and down. As it is lifted, it creates a

pump.

vacuum which draws liquid into the pump body. As

the diaphragm is forced down, it forms a pressure

which simultaneously closes the inlet valve and

opens the out-let valve.

3. Pump Data Plate - Engine Data Plate-Trans. Data

Plate.

Figure 1B

Figure 1A

PUMP DATA PLATE

TRANSPORTATION DATA PLATE

Figure 1C ENGINE DATA PLATE