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Pump PartsPump Parts Identification Discharge Side of the Pump- The discharge side of the pump receives water from the volute of the pump and distributes to the discharges, tank fill and deck gun. Suction Side of the Pump- Consists of the pre-connected intakes, keystone and tank to pump valve that all direct water to the eye of the pump. Relief Valve- Relieves pressure from the discharge side of the pump to the intake side of the pump. It uses a water line that runs from the discharge to a pressure chamber on a pilot valve. The pressure chamber is controlled by an adjustable spring. The line continues past the pilot valve to the pressure relief valve mounted on the discharge side of the pump. Once pressure exceeds the setting of the spring, the valve opens, directing water thru a dump line to the intake side of the pump. The resulting pressure change in the line from the pilot valve to the relief valve causes the relief valve to open, allowing water to pass from the discharge side of the pump to the intake side of the pump until the correct pressure is achieved. Suction Side Relief Valve- On the intake side of the pump. It is a preset valve, at roughly 150 psi, that will open once the preset limit has been reached. And discharge the water onto the ground via a 2 1/2" discharge under the engine. This relief valve reduces the possibility of damage to the pump and hose lines caused by water hammer. Priming System- Using either a rotary vane or rotary gear pump that has 0% slippage it creates a negative atmosphere inside the pump. This causes the atmospheric pressure outside to force water in the suction into the pump. The max lift is 25', max theoretical lift is 33.8', and the tested lift is 10' high in 20' of hard suction. Some of our rotary vane pumps require Sierra Anti Freeze for lubrication (environmentally friendly). The rest of our rotary vane pumps are self lubricating. Tank Fill/Recirculate-A valve from the discharge manifold to the tank used to fill the tank. Can be used to circulate water from the pump to the tank in order to keep the pump cool. Tank Suction/Tank to Pump- Allows water to be drawn from the tank to the suction side of the pump. Can be closed to allow the pump to be isolated from the tank so that you only draw water from the pump suctions. Number of 2 1/2" Discharges- Rule of thumb is for every 2 1/2" discharge the pump is capable of pumping 250gpm. Discharge and Compound Gauge- Compound Gauge measures water pressure (psi) or vacuum (inches of mercury) on the intake side of the pump. Discharge Gauge measures pressure (psi) as it leaves the pump before it reaches the individual discharge gauges. Pump Cooler- A valve that allows water from the pump to be discharged into the tank Engine Cooler- Radiator fluid passes thru the body of the cooler and passes by tubes with cool water from the pump running thru them. The radiator fluid conducts its heat to the water in the tubes, reducing the temperature of the exiting radiator fluid. Foam Pro Control-Proportions foam into the discharge manifold. Allowing for foam to be pumped thru specific lines, typically booster lines, pre-connected hose lines and 1 1/2" discharges. Can select to display % of foam, gpm flowed, total gallons flowed and total foam flowed. Pump Drive Control and Drive Assembly Midship- Power from the engine goes to the transmission, to a drive shaft then to a transfer case. If the transfer case is in "Road “it sends power thru a drive shaft to the rear duels. In "Pump" power is disconnected from the rear duels and transferred thru the case to the pump. PTO- Power from the engine goes to the transmission. The transmission sends power to the rear duels via a drive shaft. If the PTO is engaged, a gear box attached to the transmission takes power from the transmission and sends it to the pump via a separate drive shaft. Auxiliary- A pump that is powered by a gasoline or diesel engine independent of the engine used to drive the vehicle. Hydrostatic- The engine delivers power via a shaft off the front of the engine to a hydraulic pump. The hydraulic pump, pumps fluid from the reservoir via a hydraulic line to the hydraulic motor on the fire pump. The fluid is then returned via a hydraulic line to the reservoir. The speed of the fire pump is controlled by a squash plate that limits the pressure of the hydraulic fluid delivered to the fire pump. Pump Rating Placard- A placard that indicates how much gpm the pump can flow at a specific pressure from a draft.