ATEX approval for solvent pumpsets
A
Roban Engineering product story
Edited by the Engineeringtalk editorial team
Feb 2, 2004
The range of pumpsets for solvents and volatile liquids from Roban Engineering is now ATEX approved.
The range of pumpsets for solvents and volatile liquids from Roban Engineering is now ATEX approved.
They are suitable for applications such as paint, ink, solvents, printing, packaging, petrol chemicals, pharmaceutical, cosmetics, perfumes, oils, resins and liquid fuels to name but a few.
The R300 Series pumpset is fitted with Roban's popular IG301S pump, designed specifically for handling solvents and is manufactured exclusively.
The pump features: self priming action; suction lifts up to 7.6m; positive displacement; a PTFE mechanical seal; carbon bush bearings; a bypass relief valve; an inlet strainer; and an ATEX motor.
Flow rates are up to 136 litre/min, and delivery pressure is up to 2bar(g).
The pump body is made from an iron casting with a machined cylindrical pump chamber and a tangential inlet and outlet.
The body also incorporates an inlet filter chamber and outlet bypass relief valve together with a bearing block for the main drive shaft and seal housings.
The outer rotor is mounted on a drive shaft, which runs in carbon bearings in the bearing housing.
In effect the rotor is the pump impellor and provides the driving force in the pump chamber.
The inner rotor or idler gear rotates on a stub shaft set in the front cover of the pump and engages wit the outer rotor by which means it is driven.
Since the rotors mesh between the inlet and outlet they form a seal between the high and low-pressure areas of the chamber.
The crescent shaped stationary abutment is an integral part of the front cover and is designed to act as a seal between the unmeshed teeth of the rotors.
By this means, liquor is transferred from the low pressure to high-pressure area.
At the point where the teeth of the rotors disengage a low-pressure area is created in the vicinity of the inlet, which induces liquor into the chamber filling the voids between the teeth.
The liquor is then carried round by the two rotors pass the seal formed by the crescent shaped abutment with a positive displacement action into the high-pressure area of the chamber before discharging through the outlet.
The working parts and pump chamber are machined to close tolerances with minimum clearances resulting in a highly efficient pump with little if any slip or shear.
Under normal operating conditions, the Roban pumpset will provide a suction lift of around 7.6m.
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