Pressure Control/Safety Overflow Valve - ProMinent alpha General Operating Instructions

Hydraulic Accessories
Type DHV-S-DL 1-10 bar
Pressure relief knob
Pressure setting screw
Lock nut
fig. 35
Type DHV-S 0,5-10 bar
Type DHV-SR 1-10 bar
Type DHV-RM 1-10 bar
Protective cap
Pressure setting screw
Lock nut
fig. 36
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9.2

Pressure Control/Safety Overflow Valve

ProMinent ® DHV-DL (DHV-S, DHV-S-DL, DHV-SR, DHV-RM)
Pressure control/overflow valves for installation in metering line:
• Adjustable pressure control valve for installation in metering lines.
• Used to produce a constant backpressure to ensure precision delivery
when metering with free outlet,for admission pressure on intake side, for fluctuating
backpressure or metering to vacuum.
• Also used as safety overflow valve.
• If used as pressure control valve for avoiding resonance:
Installation at end of metering line or set pressure (set pressure / line pressure) loss.
IMPORTANT
Pressure control/overflow valves are shut-off elements which do not close absolutely tight.
The DHV-S, DHV-S-DL series is used in conjunction with pulsation dampers only with free outlet
and a short metering line.
The DHV-SR/RM series is not subject to the effect of backpressure and is therefore particularly
suitable for use in cases of fluctuating backpressure at the pipe outlet and for use in
conjunction with pulsation dampers or longer metering lines. The DHV-SR/RM series can be
installed at any point along the metering line.
Installation and Setting Notes
Prior to pump start-up:
S
Unscrew pressure setting screw against pressure release knob (pressure relief).
S During pump operation:
Produce required backpressure by turning in pressure setting screw; read off setting
pressure at pressure gauge installed in pipe.
Lock pressure setting screw:
S
Tighten lock nut.
Pressure relief:
S
Turn in pressure relief knob against stop of pressure setting screw plus one turn.
S Turn back pressure relief knob, the operating pressure previously set is now effective.
S Remove protective cap.
S Prior to pump operation:
Unscrew pressure setting screw for pressure relief until it turns easily.
During pump operation: Produce required operating pressure by turning in pressure setting
S
screw:
Read off set pressure at pressure gauge installed in pipe system.
S Secure pressure setting screw:
S Tighten lock nut.
At required pressure relief, release lock nut and unscrew pressure setting screw until it
S
moves easily.
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