Steam driven air pump for brakes

[Werner SchleidtParticipant @wernerschleidt45161]

Hello all,

is there any knowledge about steam driven air pumps? I build for my own steam water pumps and now I want to start an air pump for braking. I think the steam part ist he same as in a water pump, but for the air part I have no idea.

How large have to be the steam piston in relation to the air piston and which checkvalves have to be used.

Many thanks in advance for any replies

Werner

[bernard towersParticipant @bernardtowers37738]

definitely air pressure braking not vacuum

[Werner SchleidtParticipant @wernerschleidt45161]

The pump should load a reservoir with a pressure of around 3 bar/21 psi

[noel shelleyParticipant @noelshelley55608]

Werner is it 3 bar or 21psi ? 3 bar is about 45psi. If you want 45 psi I look to the air piston being the same as the steam piston. If you only want 21psi then the air piston could be twice the size of the steam piston in area. Noel.

[duncan webster 1Participant @duncanwebster1]

<p style=”text-align: left;”>I think noel means twice the area</p>

[Werner SchleidtParticipant @wernerschleidt45161]

Hi Noel, you catched me I made a dizzy mistake yes I mean 3 bar and I took the wrong conversion number.

That is a good answer for the piston area  for a rough idea. I think I make at the beginning a simple air cylinder to drive with by an electric motor so I can have an idea of the power consumption by simple measurements and I can play with the valves, thightness and so on. I have no idea how the lenght of the working stroke of the piston is divided up in compression and pressure building up to a reserviour. If I compare it to a bicyle hand pump, only 20 % of the volume are overcome the tube presssure. If this is correct it last very long to load a reserviour.

Many thanks for all your replies

Werner

[Author]

Posts