3 - Description
3.4
Safety valve (BK units)
The safety valve acts like a fuse when the circuit carries out an oper-
ation that causes a sudden increase in pressure.
This valve normally keeps the return to tank in a closed position by
way of a spring and washer. When the amount of pressure in the cir-
cuit is above the maximum allowed for the valve, this opens and
allows the flow to return.
The valve opens at 220 psi (15 bar).
Do not remove the safety valve from the liquid circuit as this could put your safety at risk.
Diaphragm pump with 2 diaphragms, model 321, with easily accessible valves and diaphragms. Standard = 540 r.p.m (6
splines).
Pump
Pressure damper
To avoid the vibrations caused by pressure pulses in the liquid cir-
cuit, the 321 pumps are fitted with a pressure damper. The air pres-
sure in the damper is preset at the factory. If adjustment is desired,
see “Operation” section for adjustment procedures.
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