Page 12 of 12
BA_2009_2_GB_DR4
6. Specification
Pressure adjustment range: .................................................................................................... 40 ... 350 bar
Maximum Flow rate: ............................................................................................................ 650 ccm/minute
Temperature range: ........................................................................................................ - 20° C to + 100° C
Useable lubricants:
Oil or grease .................................................................................................................... max. NLGI class 2
Weight: ................................................................................................................................................ 7.0 kg
Material:
Metal parts (body etc.) ........................................................................................................................... Steel
Seals ...................................................................................................................................................... Viton
7.
Service / Start-up
Adjustment
It will be noted that the control of pressure is accomplished through the use of a spring in compression
between the adjusting bonnet and the piston assembly. To raise the operating pressure on the system the
adjusting bonnet, should be turned clockwise after slackening off the locknut. When the pressure is correct,
tighten up the locknut so there will be no further movement of the adjusting bonnet.
Maintenance
The valve will operate for many years without any maintenance provided that new clean lubricant is
pumped into it. If the valve is clogged with dirt, it can be disassembled. It is important to note which pistons
are assigned to which boreholes. Clean the valve in solvent. Put the pistons in the right boreholes and re-
assemble the valve. As the pistons are produced and fitted into the corresponding boreholes with very tight
tolerances, it is not possible to mix up the pistons on site.
Fault finding
Besides ingress of contamination, the most common reason of failure is when the valve has been applied
with a greater flow rate than the maximum stated in the specification. Excessive flow will cause the flow
directing piston to "bounce" when moving across and find a position which will lock-up the valve. To release
it from this state, after exhausting any pressure, the piston closure plugs can be removed and the pistons
pushed fully to one end of their bores.
