What happens when the head of a pump is lowered?
In this situation the pump will deliver its maximum pressure. If the pipe end is lowered as in Figure 10, the pump flow will increase and the head (also known as total head) will decrease to a value that corresponds to the flow. Why?
How does a hydraulic pump maintain low pressure?
As outlet pressure increases it will shift the spool and destroke the pump. • Standby Pressure is the pressure level the pump will maintain with no load sense signal. • The load sense bleed option will vent the load sense signal to allow the pump to go to low pressure standby when there is no flow demand.
Where is the lowest pressure on a positive displacement pump?
The inlet, or suction side of a pump is the point of lowest pressure in a given pump. For positive displacement pumps, the lowest pressure occurs just prior to rotor meshing; for centrifugal pumps, lowest pressure is near the eye of the impeller.
What happens when the load on a hydraulic pump increases?
Hydraulic Pump/Motor Division. If the load pressure increases, the pump outlet pressure will increase proportionately to maintain the constant pressure drop across the orifice. Fortunately most load sense controls also incorporate a pressure limiter feature which limits the maximum pressure the pump will achieve.
Can a top pump be attached to a top frame?
The new cylinder will have its piston in the ‘retracted’ or ‘down’ position therefore attaching it to the top frame will not be possible at this time. Operating the top pump will fill the cylinder with fluid and extend the piston rod until it can be attached to the top frame.
Where is the top pump on a convertible?
The pump is usually located in the trunk area of the car and will most likely be held in place by 3 or 4 pointed grommets which push into holes in a bracket, the rubber grommets provide a cushion to reduce noise when raising and lowering the top.
How much psi does a car top pump produce?
The pump is capable of producing between 300-450 PSI depending on the type of pump and year of car so use caution. FLUID- Most cars 1967 and newer use automatic transmission fluid, from 1962-67 they may have used either automatic transmission fluid or brake fluid.
What kind of oil does a convertible top pump use?
NOTE-Pumps and cylinders purchased from Convertible Top Specialists may be filled with fluid, this fluid will either be Dextron III automatic transmission fluid or mineral hydraulic oil.