© Edwards Limited 2007. All rights reserved.
Page 3
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Introduction
A344-02-880 Issue J
1.2
Description
Note:
The following section refers to
unless stated otherwise.
The E1M40, E1M80, E2M40 and E2M80 pumps are single or two-stage oil-sealed, high-vacuum pumps designed for
reliable, long-term operation in both laboratory and industrial environments. A single-phase motor or a four-pole
three-phase motor provides direct-drive through a flexible coupling. The pumps are free-standing mounted on steel
runners.
The E1M (single-stage) pumps have a high-vacuum rotor and stator assembly with integral sliding-vane oil-pump. The
E2M (two-stage) pumps have an additional low-vacuum rotor and stator assembly.
Lubrication is provided by a sliding vane oil pump. Oil is drawn into the pump through a wire mesh strainer. The oil
is pumped to a spring-loaded distributor valve. The distributor valve directs a lightly-pressurised supply of oil to the
main vacuum-pump and by-passes the excess back to the oil reservoir. Some of the excess oil is re-directed through
a large area, fine-pore filter and some through a relief-valve. When you switch off an E2M40 or E2M80 pump with the
gas ballast control closed, the spring loaded distributor valve provides oil and air suckback protection. The distributor
valve provides only oil suckback protection when you switch off an E1M40 or E1M80 pump. To obtain air suckback
protection when you switch off an E1M40 or E1M80 pump, you must fit a solenoid operated gas-ballast control valve:
refer to the information in
.
You can inspect the level and condition of oil in the oil box through an oil-level sight-glass (7). An oil filler-plug (6)
is fitted at the top of the oil box. An oil drain-tap (8) is fitted at the bottom of the oil box.
The inlet-port flange (4) is compatible with ISO40 or NW40 fittings. The outlet-port (5) has an NW25 flange.
The gas-ballast control (11) allows you to control the introduction of gas-ballast when pumping high vapour loads.
Refer to
for more information about gas-ballast.
for details about vibration isolators and other recommended accessories.
1.3
Gas-ballast
To pump high vapour loads, gas-ballast is delivered into the pump to prevent condensation of the vapour carried by
the pumped gases. This system reduces oil contamination and pump corrosion caused by condensed vapour from the
pumped gases.
You can introduce air or an inert gas into the low vacuum stage of the pump through the gas-ballast inlet (
,
item 3). A filter/silencer is fitted in the gas-ballast system, to prevent the entry of dust into the pump and to improve
silencing. You can control the gas-ballast either manually or remotely.
Note that the E1M40 and E1M80 pumps have a permanent air bleed through the gas-ballast inlet.
Содержание E1M40
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