Hydra-Cell Crank Shaft Design Principle of Operation

 

Crank Shaft Models

	Drive shaft		Diaphragms
	Precision ball bearings		Suction valve assembly
	Connecting rods		Discharge valve assembly
	Hydraulic cells (patented)		Pressure regulating valve (in-line)

 

Reliable, Efficient Pumping

The drive shaft (1) is held in position by two ball bearings (2) positioned at either end of the shaft. Located between these bearings are either one or three cam shaft lobes with connecting rods (3) that are hardened, precision ground, and polished.  By machining to very close tolerances on the cam lobes and connecting rod surfaces ensures proper lubrication and reduced operating temperatures in the hydraulic end of the pump. 

As the drive shaft turns, each cam actuates the attached connecting rod that is fixed in position at the end of each hydraulic piston. This action moves the piston forward and backward, converting the axial motion into linear pumping motion.  The complete drive shaft and connecting rod assembly is submerged in a lubricating oil bath.

Each piston contains a patented Hydra-Cell hydraulic cell (4) that is moved sequentially by the crank-shaft. The innovative Hydra-Cell design maintains the precise balance of oil behind the diaphragm (5) regardless of the operating conditions.  The oil in the Hydra-Cell is pressurized on the forward stroke of the piston causing the diaphragm to flex, which drives the pumping action.  The oil held in the Hydra-Cell balances the diaphragm against the fluid being pumped, maintaining no more than a 3 psi/0.2 bar differential regardless of the pressure at which the fluid is being delivered – up to 172 bar on standard Hydra-Cell models and Hydra-Cell metering pumps.

Hydra-Cell crank shaft pumps have up to three diaphragms and each diaphragm has its own pumping chamber that contains a suction and discharge self-aligning horizontal disk check valve assembly (6). As the diaphragms move back, fluid enters the pump through a common inlet and passes through one of the suction check valves.  On the forward stroke, the diaphragm forces the fluid out of the discharge check valve (7) and through the manifold common outlet.  Equally spaced from one another, the diaphragms operated in sequence to provide consistent, low-pulse flow.

A Hydra-Cell pressure regulating valve (8) is typically installed on the discharge side of the pump to regulate the pressure of downstream process or equipment and to protect the system from over-pressure.

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