Blog Archives

Hydraulic Presses Machines

Presses action are typically used for molding, shaping, shearing, and many other operations. To understand the hydraulic pressing calculation, let us set an example of a 30-in. bore and 10-in. stroke hydraulic press cylinder. The system needs to complete the … Continue reading

19. November 2012 by JackSparow
Categories: Hydraulic Circuits | Tags: , | 3 comments

Gear-Type Flow Divider Valve

The gear-type flow divider valve works like two hydraulic gear motors with attached shafts. The both motor must have to run at the same speed since their shafts are attached. Thus, the same flow goes through both sides. The flow … Continue reading

05. November 2012 by JackSparow
Categories: Flow Control Valves | Tags: , | 1 comment

Hydraulic Automatic Transmission Performance

Six gears direct-drive transmission and three shifts automatic transmission/ torque converter performance is shown in figure above. In the figure we can see that three shift on torque converter have the power transfer bands as smooth as the power line … Continue reading

03. November 2012 by JackSparow
Categories: Hydraulic Circuits | Tags: , | Leave a comment

Gearboxes Hydraulic Pump Mounts

Hydraulic pump mounts are gearboxes that are designed to drive the pumps. These gearboxes have one input and provide connections for mounting one to four pumps on the output side. Mounts can be equipped with clutches and available for different … Continue reading

01. November 2012 by JackSparow
Categories: Hydraulic Pumps | Tags: , , | Leave a comment

Multiple Hydraulic Pump Circuits

The multiple hydraulic pump types install two or more pumps in the same housing and use a single shaft to drive. Each pump has its own outlet although in some application one inlet is provided. The pump shown in figure … Continue reading

31. October 2012 by JackSparow
Categories: Hydraulic Pumps | Tags: , , | Leave a comment

Hydraulic Vane Pump Volumetric Efficiency

Vickers Pump Model 25V-T is a hydraulic vane pump which has a 4.81 in3/rev displacement with max speed 1800 rpm and max pressure 2500 psi. The vane pump volumetric efficiency at 1200 rpm decreases from 97.3% at 500 psi to … Continue reading

31. October 2012 by JackSparow
Categories: Hydraulic Pumps | Tags: , , | Leave a comment

Basic Hydraulic Servo Systems

Four basic hydraulic servo systems: 1. Valve motor two servo actuator system or servo motor. 2. Valve cylinder two servo actuator system or servo cylinders. In two servo-actuator systems, the valve is mounted directly on the actuator to avoid the … Continue reading

30. October 2012 by JackSparow
Categories: Hydraulic Circuits | Tags: | Leave a comment

Hydraulic Gerotor Pump Volumetric Efficiency Characteristic

Hydreco Model 1919 is a gerotor hydraulic pump with 4.53 in3/rev displacement. The pump has maximum speed of 3000 rpm with 2500 psi maximum pressure. The pump volumetric efficiency drops from 92% at 500 psi to 78% at 2500 psi … Continue reading

29. October 2012 by JackSparow
Categories: Hydraulic Pumps | Tags: , | Leave a comment

Hydraulic Variable Displacement Pump

An expensive hydraulic variable displacement pump offers many options for hydraulic circuit design. The pump displacement can be changed using a servo valve to manipulate the actuator speed movement. The open loop hydraulic design as shown in figure above can … Continue reading

29. October 2012 by JackSparow
Categories: Hydraulic Pumps | Tags: , , , , | Leave a comment

Hydraulic Closed-Center System Using Variable-Displacement Pump

The figure above shows a closed-center system with a variable-displacement pump in the neutral mode. When the pump in neutral mode, the hydraulic oil is pumped until it reaches a predetermined pressure level. A pressure regulating valve allows the pump … Continue reading

22. October 2012 by JackSparow
Categories: Hydraulic Circuits | Tags: , | Leave a comment

← Older posts