Small Hydraulic Systems

I would be happy to help with the hydraulic system, but you'll have to get someone else to do the electrical work. My price is reasonable.

This is a basic question in hydraulic

I am also interested to hear some one to reply with sketches and flow diagram

Thanks

Ali

Before we can indulge in this exercise it is necessary that you should provide some detail of what is required to be done by the hydraulic system.

This will enable the u/s to develop a user friendly system with minimum of part and equipment requirements.

You may contact me directly on the following address:

naveed-athar@centurypaper.com.pk

Regards

NAVEED ATHAR

GM PLANT ENGINEERING

CENTURY PAPER & BOARD MILLS, LAHORE, PAKISTAN

It would help to know where you are. Availability and design standards vary in different countries.

You can reach me at: harryburt@mail.com

Hi,

Before I can recommend to you a system, please let me know (1) the speed and torque requirement of each motor (2) whether the motors will work in tandem or one at a time (3) whether you have any of the components already with you or you have to procure all of them (4) what is the application

In general you can go for a system with four solenoid valves with 'P' blocked in neutral and a relief valve with unloading solenoid valve. It should serve the purpose unless there is some complication arising out of the application. If you have not procured the pump already you can even choose a variable delivery pump with flow and pressure control so that you can just develop the flow that is required for the particular motor. In this way you can avoid, heat building up in the system which may arise if you use flow control valves. I hope you can calculate the flow requirements.

raghuraman.tr@rediffmail.com

As others have replied significantly more detail is required before much can be properly specified. The system can be done a number of different ways depending on the actual application details.

You must be able to give details on the following :

Motor Torque- What is the torque required and is it continuos or intermittant. Also is this torque is required at start up or is the application unloaded to start.

Motor Speed Range - It is also necessary to have the speed range that the motors will be running at and what speed range they will be adjusted to and from. Different types of motors have differing speed ranges that they work best at. Do you need max torque and speed simultaneously?

Number of Motors - Are all four motors running at once or individually, Two at a time. This is critical to size the pump and prime mover adequatley.

Prime Mover - You need to state what is going to be driving the pump. Electric-Gas-Air-Diesel etc. The speed the prime mover is turning is also critical to pump size. With the previous information on the motor you can size the prime mover to make sure it has adequate power to drive the pumps.

Controls - You mentioned two variable speed controls. The answers to the previous questions will help to lead to a suitable system but what do you need two controllers for? Why not four? Are these manually adjusted? Are they electrical? If you want electrical control is is a potentiometer/dial or proportional joystick that the operator is activated or is it PLC/computer generated output. What level of accuracy is required. Do the motors have to have synchronous speeds and if so how close in accuracy? Do the motors need to reverse. Will the load be overrunning at times. Do they need to be able to stop and hold a load?

Other Issues - To fully design this other application information is critical. What is this actually doing? What is the duty cycle? Is the environment harsh, ambient temperature extremes, how dirty is the environment, shock loading, vibration, explosion hazard, water, How critical is the application in terms of what will happen if it fails. Weight and space issues are also a factor. As is budget and as previously stated availability of parts in your region.