PRINCIPLE OF OPERATION : Premier PV Series liquid Ring Vacuum Pumps and compressors are rotary machines in which liquid is made to act as piston. A balanced cylindrical rotor with hollow hub and series of curved blades projecting radially, turns freely in a cylindrical casing which is larger in diameter than rotor. The blades of the rotor are enclosed at the sides, thus forming a series of buckets, open at the bottom into the hallow center.
In operation the casing contains sufficient liquid usually water, which when carries around the periphery of the casing by the rotor blades, forms a solid ring of liquid inside the casing, due to centrifugal force, since the rotor is smaller in diameter than the casing and rotates on a centre eccentric to that of the casing. It will be seen that during part of the cycle of rotation the rotor buckets are entirely filled with liquid, and during part of the cycle, as the liquid recedes into the casing, the rotor buckets will be partially empty.

 

 

 

 

The liquid alternately entering and clearing the rotor buckets at high speed constitutes a series of liquid piston that surge in rapid succession in and out of the rotor buckets. Air enters through the inlet ports of the cone which are located at the point where the liquid, surges away from the rotor (A) and into the casing. Discharge ports are at the point in the rotating cycle where the liquid again surges back into the rotor buckets (B) permitting the compression and discharge of the air. This effect is continuous and is repeated thousands of time per minute, producing an un-interrupted air flow without pulsation/vibration.
When the inlet is connected to closed system and the outlet to atmosphere the machine will draw air and gases from the system and discharges into the atmosphere and will act as Vacuum Pump. When the inlet is connected to the atmosphere and the outlet to a closed system the machine will draw air from the atmosphere and discharges into the system and will act as Compressor.
The liquid ring acts not only as a piston to compress the gas/air but also absorbs the heat produced due to compression friction and any latent heat from vapour condensation occurring.

CONSTRUCTIONAL FEATURES:

Body, Heads, Cones are made of close grained heavy duty cast iron and rotor of spheroidal graphite(SG) iron free from the cavities and blow holes. The shaft is made of carbon steel and carries the only one moving part, the rotor which is balanced for vibration free runing. The shaft is carried on both the ends antifriction Ball/roller bearings which maintain the close running clearence between working parts through out the working life of the pump.
The Pumps can also be supplied with contact parts in phosphor bronze and stainless steel of suitable grade.
The bearings of pumps are arranged for grease lubrication. The stuffing box which prevents the leakage of gases and or air from the machine to the atmosphere or vice versa is proportioned for efficient operation by using a good quality packing rope. Replacebale shaft sleeves of phosphor bronze/stainless steel are provided at the stuffing box portion of the pump.


SPECIAL ADVANTAGES:

Premier PV series vacuum pumps will have two inlet and four oulet flanges. For normal operation two discharge flanges of any one side are connected in parallel by outlet manifold and other side flanges are blanked.
Due to the twin inlets available the pump can be operated as two independent vacuum pumps of half the capacity at different vacuum levels.
Enhanced capacity can be achived when handling saturated gas by using inlet spray nozzles provided near the suction flanges of the pumps.
Large ports ensure liquid/particulate matter carried over from the process can be handled without disruption.
The rotor design improves efficiency; maximises capacity/speed range and reduces noise levels.

APPLICATIONS:

Paper Industry Sugar Ondustry Chemical & Pharmaceutical Industry
Minerial Beneficiation/Washeries Textile Industry Steel Plants
Thermal & Atomic power plants Fertilizer plants

PUMP SIZES:

We are presently manufacturing PV Series Vacuum Pumps as listed below.

Premier Series

Nash Series
PVL-5
CL 201
PVM-5
CL 202
PVH-5
CL 203
PVL-7
CL 301
PVM-7
CL 302
PVH-7
CL 303
PVL-10
CL 401
PVM-10
CL 402
PVH-10
CL 403
PVL-20
CL 701
PVM-20
CL 702
PVH-20
CL 703
PVL-30
CL 1001
PVM-30
CL 1002
PVH-30
CL 1003
PVL-45
CL 1501
PVM-45
CL 1502
PVL-60
CL 2001
PVM-60
CL 2002
PVH-60
CL 2003
PVL-90
CL 3001
PVM-90
CL 3002
PVH-90
CL 3003
PVL-120
CL 4001
PVM-120
CL 4002
PVH-120
CL 4003
PVL-180
CL 6001
PVM-180
CL 6002
PVH-180
CL 6003
PVL-270
CL 9001
PVM-270
CL 9002
PVH-270
CL 9003

Gardner Denver Nash® is registered trademark of their
respective original manufacturing pump company, none of which have any affiliation with Premier Pumps.

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