Ancillaries - Gardner Denver TR20 Installation Operating & Maintenance Manual

Fig 10. Relief valve orientation
4990497003 Date: 11/2016
Installation
3.8

Ancillaries

(relating to figures 10a - 10b)
Inlet Air Filter and Flexible Induction Kit
Should be located so that the inlet air is cool and clean. Do not mount close
to exhausts or other warm air sources.
Relief Valve
The relief valve is installed to prevent the TR20 from encountering pressures beyond
its operating range.
The relief valve should be installed as close as possible to the discharge port
of the machine prior to any other discharge ancillary and should be mounted
vertically (as shown in fig 10 ).
It is pre-set, wired and leaded (tamper proof ) and fitted to protect the TR20 (rather
than the system which should be protected by the vehicle tank relief valve) against
pressures of over 2.2bar g . Adjustment of the machine relief valve will invalidate the
TR20 and relief valve warranty.
Discharge Silencer
Should be mounted/connected as close as possible to the discharge port (after the
relief valve) utilising the slip-on-weld flanges supplied.
Silencers should be mounted/supported separately to prevent the generation of
loads on the machine and discharge port due to weight or temperature expansion.
Flexibility in the mounting or connecting pipework to the silencer should be
incorporated where this could occur.
Check (non-return) valve
This is to prevent a back-flow of air and product (often encountered when stopping
compressors whilst the discharge tank is still pressurised) from entering and
damaging the TR20.
The check valve should be the last ancillary on the discharge pipework (but
before any regular disconnection point) to protect all the other ancillaries. It
is often mounted directly to the delivery port of the discharge silencer.
If the check valve is mounted horizontally, the check valve hinge should be
positioned at the top in horizontal pipework to encourage closure under gravity.
Torque Coupling
We recommend and supply a torque-limiting device for fitting to the
compressor when direct PTO driving.
This is to protect all the drive-line equipment against the possibility of high
torque during operation for any circumstances.
Expansion Joints
Any pipework or equipment should incorporate flexible elements where:
• Movement due to thermal expansion is likely
• Pipework crosses the vehicle chassis.
Ball Valve
A 1" - 1.5" manual ball valve must be fitted on the discharge side of the
machine between the compressor discharge port and the check valve.
This allows the compressor discharge air to vent to atmosphere to prevent
the machine being started against a pressurised tank.
Commissioning Filter
See section 3.7
TR20 Installation, Operating & Maintenance Manual Page 13