Quantcast Relief and Check Valves

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The garage lift platform and loading areas should be illuminated at all times when it is in
operation. An intensity of not less than one foot-candle should be maintained at all points.
12.2.3 Power Unit
12.2.3.1 Main Line Switch. The inspector should closely examine the condition of the main line
switch before inspecting any moving part because opening the switch may not have removed all
power from a particular lift. This condition is very prevalent when lifts share the same pump
unit.
12.2.3.2 Pumps. Pumps can be of the direct-connected type or driven by multiple V-belts.
12.2.3.3 Assembly. A standard garage lift power unit consists of a hydraulic oil reservoir, a
pump unit, an electric motor for driving the pump, and a manual lowering valve in case of power
failure. A typical power pack can support up to 40 lifts, (each unit operating individually, one at
a time) although typical installations have no more than 6-8 lifts per unit.
12.2.3.4 Pumps. Pumps should be checked for leakage around the shaft, and for unusual noise
which could be caused by cavitation due to a partially plugged suction line or strainer.
12.2.3.5 Drives (if applicable). Belt drives should be checked for wear, initial tension, and
reasonable equality of tension among members of a set. Chain drives should be checked for
wear, both on the chain and sprockets. Direct-drive couplings, where accessible, should be
checked for excessive play.
12.2.3.6 Relief and Check Valves. Determine whether relief and check valves are provided and
properly located. Examine relief valves, where provided, and note their condition and whether
there is leakage. Relief valves should have a lead block and wire type seal on the means of
adjustment and should be intact. Determine whether the check valve operates to stop and hold
the lift when the pump stops.
12.2.3.7 Flexible Hydraulic Hose and Fitting Assemblies.
Examine under working pressure, flexible hydraulic hose and fitting assemblies and flexible
couplings installed between the check valve or control valve and the cylinder.
12-3





 


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