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3 - Description
Manifold system
The pressure circuit HLC (Hardi Liquid Circuit) is used with diaphragm
pumps. The HLC distributor has three mechanical valves.
Valve (A) operates the agitator.
Valve (B) activates the powder mixer which flushes powder chemicals
through the tank strainer.
Valve (C) activates the rotating rinsing nozzle for rinsing the main tank
inside when the liquid circuit is rinsed with clean water.
Each function is identified by a pictorial symbol. Valves (A) and (B) are
optional.
Safety valves
The safety valve protects the liquid circuit against over pressure in the
event of failures or clogged lines.
If the spring-loaded safety valve opens the liquid is lead back to tank
via hose (A).
The safety valve opens at15 bar.
DANGER! Do not remove, bypass or block safety valve from the
liquid circuit as this could put your safety at risk.
Blue valve – Blue disc = Return valve
Towards agitation Towards the suction pump
The position of the return MANIFOLD valve determines where the
excess flow from the fluid circuit goes. When the arrow on the handle
points to a symbol, the excess fluid will be fully sent towards that
function (the example shows agitation). This valve does not have the ‘0’
position.
Pressure pulsation damper
The 321 pump is fitted with a pulsation damper on suction and
pressure sides. The pressure side damper is pressureized. The dampers
will reduce pulsations and secure an even flow from the pump.
The pressuredamper should be inflatedto the pressure shown in the
table on top of the pulsation damper (A).
A B C
A
A
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