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VRX vent - restrictor
B580-65-880 Issue G
10 VRX vent - restrictor
10.1 Description
Notes: 1. A VRX vent-restrictor can be fitted in any EXT pump vent-port or purge-port.
2. EXT250M pumps are supplied with a purge port (sealed with a purge plug), and with VRX10
vent-restrictors fitted in the vent and purge ports.
Fit a VRX vent-restrictor to your EXT pump if you will vent the pump when the pump speed is above 50% of full
rotational speed. The vent-restrictor restricts the flow-rate of the vent gas into the EXT pump.
You can fit the VRX vent-restrictor directly to the inlet of a vent-port adaptor, together with a TAV vent-valve
(if required). Note that you must fit the vent-restrictor before you fit the TAV vent-valve or vent-port adaptor.
10.2 Technical data
10.3 Installation
10.3.1 Unpack and inspect
Remove all packing materials and protective covers and check the vent-restrictor. The VRX identification number
(Figure 31, item 5) is located on the restrictor base; for example, if you have a VRX20 vent-restrictor, ‘20’ will be
shown on the base of the restrictor.
If the vent-restrictor is damaged, notify your supplier and the carrier in writing within three days; state the Item
Number of the vent-restrictor together with your order number and your supplier's invoice number. Retain all packing
materials for inspection. Do not use the vent-restrictor if it is damaged.
10.3.2 VRX vent-restrictor selection
Make sure that you have the correct vent-restrictor for your pump and vacuum system. Refer to your EXT pump
instruction manual for selection details.
You must not exceed the maximum allowable rate of pressure rise specified in the EXT pump instruction manual.
Table 11 - Vent-restrictor technical data
VRX Orifice diameter Item Number
VRX10 0.1 mm B580-66-021
VRX20 0.2 mm B580-66-022
VRX30 0.3 mm B580-66-023
VRX50 0.5 mm B580-66-024
VRX70 0.7 mm B580-66-025
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