Vane Pump

Vane Pump 

a positive-displacement pump with reciprocating rotary motion of the operating member; it is used to pump fluids. The cylindrical housing of a vane pump contains a rocking rectangular vane with delivery valves, which acts like a piston, and partitions with inlet valves. Oscillatory motion is usually imparted to the vane by hand, and the fluid is sucked in and forced out. Double-action vane pumps have come into common use for pumping various fluids containing no abrasive contaminants (water, petroleum products, and so on) for short periods. They can deliver 2–12 m³/hr, with a head of 10–20 m.

Table 1. Most common varnishes and some of their properties
	Drying conditions		Material of substrate	Adhesion of coating to metal	Conditions of use
	temperature (°C	time (hr)
1Dry upon addition of catalysts
2Dry upon addition of hardeners
3Reversibility of films is caused by the absence of reactive groups in the film-former (for example, a copolymer of butylmethyl acrylate with other acrylates)
Varnishes that form irreversible films Oil..................	18-20	24	metal	good	indoors and outdoors
Oil-bituminous...........	120-200	0.5-2.0	metal	good	indoors and outdoors
Alkyd ...............	18-2080-160	24-48 1–4	metal metal	good good	indoors and outdoors
Polyester..............	18-2060-70	24 0.5-1.0	wood	_	indoors
Urea-formaldehyde1 ......	18-20	2	wood		indoors
Urea-alkyd............	100-130	1.0-1.5	metal	satisfactory	indoors
Melamine-alkyd .........	90-130	0.5-1.5	metal	satisfactory	indoors and out-
Phenol-formaldehyde (resol)	18-20	24	metal	satisfactory	doors indoors at
Phenol-oil.............	18-20150-180	24 1–2	metal	good	temperatures up to 160°-170°C; in alkalies and acidsindoors and out-
Epoxy1 ..............	150-190	1-3	metal	good	doors indoors at temperatures up to 160°-170°C; in alkalies and acids
Polyacrylic............	80-150	0.5-2.0	metal	good	indoors and outdoors
Polyurethane...........	18-20	2-24	metal and wood	good	indoors and outdoors
Polyvinylacetal2.........	18-20	3-5	metal	good	indoors and outdoors
Silicone...............	150-200	1-2	metal	satisfactory	at temperatures
Varnishes that form reversible films
Shellac (alcohol)...............	18-20	2	wood and glass	-	indoors
Bituminous (asphalt)...............	18-20	3	metal	good	indoors
Nitrocellulose .................	18-20	1	metal and wood	poor	indoors and outdoors; in gasoline
Perchlorvinyl............	18-20 60	1.5-3.0 1	metal and wood	poor	indoors and outdoors; for short periods in acids and alkalies
Polyacrylic3 ............	18-20	1-4	metal	good	indoors and outdoors

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Vane Pump 

a type of a positive-displacement rotary pump whose working elements are a rotor, which rotates in an eccentrically bored stator, and vanes inserted in longitudinal grooves of the rotor and held against the stator by centrifugal force, springs, or the pressure of the liquid supplied from the direction of the rotor axle.