Precision Reference Thermometer

- Adjustable Pressure Relief Valve PRV-12 for direct mounting on Hand Held Test Pump HTP1.
- Protects Reference and Unit under Test.

The PRV-12 range of relief valves
provides a compact solution to the
protection of sensitive instruments
from the danger of overpressure
under low flow conditions.
The stainless steel body houses a
piston which is retained by a series
of disc springs, the number and
configuration of which control the
'cracking' pressure required (see
table below).

The PRV-12 is for use only with the HTP1 Hydraulic Pressure Test System. The
PRV-12 is simply screwed into the rear 1/4" BSP blanked off port which is reserved
for the purpose. The valve can be supplied pre-set with the HTP1 or can be quickly
retro-fitted to existing units using simple installation instructions.

Specification:

Material: Stainless steel AISI 303
Seals: Polyurethane, PTFE, Nitrile, Nylon
Fluid media: Mineral Oill, destilled water, optional "Skydrol", other media on request
Max. working pressure: 1000 bar
Dimensions: 40 mm x 22 mm Diameter
Weight: appr. 60 g
Accuracy / Repeatability: +/- 10% nom. setting

Type                 'Cracking' Pressure Range                 Order-Code
PRV-12-1          10 to 50 bar                                            210.9.000.0700.6
PRV-12-2          50 to 200 bar                                          210.9.000.0700.7
PRV-12-3          200 to 400 bar                                        210.9.000.0700.8
PRV-12-4          300 to 700 bar                                        210.9.000.0700.9
PRV-12-5          600 to 1000 bar                                      210.9.000.0701.0

Pressure adjustment is achieved by first removing the protective cap, then using a
suitable tool, turn the adjustment screw clockwise to increase and anticlockwise to
decrease 'cracking' pressure.