143 - DescriptionManifold systemThe pressure circuit HLC (Hardi Liquid Circuit) is used with diaphragmpumps. The HLC distributor has three mechanical valves.Valve (A) operates the agitator.Valve (B) activates the powder mixer which flushes powder chemicalsthrough the tank strainer.Valve (C) activates the rotating rinsing nozzle for rinsing the main tankinside when the liquid circuit is rinsed with clean water.Each function is identified by a pictorial symbol. Valves (A) and (B) areoptional.Safety valvesThe safety valve protects the liquid circuit against over pressure in theevent of failures or clogged lines.If the spring-loaded safety valve opens the liquid is lead back to tankvia hose (A).The safety valve opens at15 bar.DANGER! Do not remove, bypass or block safety valve from theliquid circuit as this could put your safety at risk.Blue valve – Blue disc = Return valveTowards agitation Towards the suction pumpThe position of the return MANIFOLD valve determines where theexcess flow from the fluid circuit goes. When the arrow on the handlepoints to a symbol, the excess fluid will be fully sent towards thatfunction (the example shows agitation). This valve does not have the ‘0’position.Pressure pulsation damperThe 321 pump is fitted with a pulsation damper on suction andpressure sides. The pressure side damper is pressureized. The damperswill reduce pulsations and secure an even flow from the pump.The pressuredamper should be inflatedto the pressure shown in thetable on top of the pulsation damper (A).A B CAA
