15
Installation Manual
Content
December 2020
Installation Manual
TR000238ENUS-01_12-20
Operation (Control Knob Adjustment)
Controlled back pressure settings are obtained using TESCOM back pressure regulators
by adjusting the control knob. Rotating the knob clockwise raises the back pressure while
a counterclockwise rotation will lower the back pressure. Final adjustments should be
made in the direction of increasing pressure to obtain the most accurate back pressure
set pressure.
TESCOM regulators will operate with any liquid or gaseous media compatible with the
wetted materials. Some series/modifications come with an internal filter designed to
stop random contamination resulting from the installation of the regulator. An auxiliary
upstream filter is recommended for use in all but the cleanest media. Gaseous media
should be free of excessive moisture to prevent icing of the regulator at high flow rates.
WARNING
A back pressure regulator is not intended to be used as a system safety relief device. When
the regulator is not in use, the inlet pressure should be turned off.
Maintenance
The following procedures are provided to enable the customer to perform all normal
maintenance and repair operations. These operations are more easily performed with the
regulator removed from the line. However, in some cases repair may be accomplished
without removal of the regulator body as long as the supply has been shut off and the
inlet and outlet pressures have been vented.
An Assembly Drawing and Bill of Material for the regulator will be needed to complete
maintenance procedures. The Assembly Drawing and Bill of Material are separate from
this manual and available by contacting TESCOM (see last page for TESCOM contact
information).
The following steps outline the disassembly of back pressure regulators for maintenance
and repair:
1.
Clamp the regulator in a vise by the flats on the bottom and/or side of the regulator
body.
2. Turn control knob and/or spring adjustment mechanism counterclockwise to insure
removal of all spring force on the diaphragm.
NOTE:
(Dome loaded regulators) All pressurized gas or liquid must be vented from
dome before disassembly.
3. Remove upper portion of regulator (bonnet and/or dome). Some models require the
mounting bracket to be removed first.
NOTE:
Upper portion of regulator may also include spring button, load spring back-up
plate, and diaphragm, etc. Review correct drawing to ensure that all parts have been
disassembled.
4. The valve parts can now be removed from the regulator body by turning the seat
retainer and/or back cap counterclockwise until it is free of the regulator body.
5. To disassemble diaphragm valve assembly and/or valve, clamp valve in smoothed jaw
vise. Clamping should be done on flats.
CAUTION
Care must be used to not damage valve.
3.3.3
3.3.4
