RECIPROCATING PUMP

Reciprocating pump is a positive displacement pump. The given pump is single acting single cylinder pump with air vessel. It can be used for less discharge at higher heads. Priming is not required because it is a positive displacement pump. Reciprocating pumps are used in pumping water in hilly areas. Reciprocating pumps has lower efficiency compared to centrifugal pumps

CONSTRUCTION:

The Main Parts of Reciprocating Pump are:

1. CYLINDER

It is made of cast iron or steel alloy. The piston reciprocates inside the cylinder. The movement of piston is obtained by a connecting rod which connects piston and rotating crank.

2. SUCTION PIPE

It connects the source of water and cylinder, the water is sucked.

3. DELIVERY PIPE

Water sucked by pump is discharged into delivery pipe.

4. SUCTION VALVE

It adjusts the flow from the suction pipe into delivery pipe.

5. DELIVERY VALVE

It admits the flow from the cylinder in to delivery pipe.

6. AIR VESSEL

It is a cast iron closed chamber having an opening at its pass through which the water flows into vessel.

WORKING:

During the suction stroke the piston moves left thus creating vacuum in the Cylinder. This vacuum causes the suction valve to open and water enters the Cylinder. During the delivery stroke the piston moves towards right. This increasing pressure in the cylinder causes the suction valve to close and delivery to open and water is forced in the delivery pipe. The air vessel is used to get uniform discharge.

SINGLE ACTING RECIPROCATING PUMP

DOUBLE ACTING SINGLE ACTING RECIPROCATING PUMP

RECIPROCATING PUMP FITTED WITH AIR VESSEL AT BOTH SUCTION AND DELIVERY SIDE