Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Identification of pressure switch operating range

Identification of pressure switch operating range

Identification of pressure switch operating range

I need assistance identifying the operating range of two pressure switches. They need replacing

They are made by a Japanese manufacturer WAKO , who I have tried communicating with but the language barrier is too hard.

The switches are discontinued . They are used in a Toyota wheel chair accessible vehicle. They are in the hydraulic circuit that lowers the vehicle.

The part is a PS-20 .

I have attached a photo of them . You can see the numbers stamped on the brass neck of the switch .

5 74
5X3 5X3

I am unsure if the identifying numbers stamped are universal if if they are specific to wako parts

If anyone can help it would be greatly appreciated

RE: Identification of pressure switch operating range

Replace them with pressure gauges.
Determine the maximum system pressure.
Select a replacement that will take 150% to 200% of the maximum operating pressure.
Replace the pressure gauges with the new switches.

Ohm's law
Not just a good idea;
It's the LAW!

RE: Identification of pressure switch operating range

Chopsider: search engines can be wonderful things.
This page gives an operating range for the switch that can be anywhere from 0.1 to 12 MPa (14 psig - 1740 psig). What the ACTUAL setpoint is can be determined through the method defined by waross.

Converting energy to motion for more than half a century

RE: Identification of pressure switch operating range

Thanks for replying Gr8blu but I have checked that page and it was not of use too me .

The 2 pressure switches control the cut of the hydraulic pump that lowers the suspension on the car .

I installed a pressure gauge on the pump as suggested by waross .

after running under caution to find operating cut out/in ,Unfortunately a seal on the shock absorber ( where the hydraulic oil is pumped to compress it) has had a seal let go in it .

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close