pressure reducer

An ambitious project. Why build something you know nothing about when you can buy one for far less time, effort and money? Do you intend to build it from scratch or start with some standard valve and alter them?

Aside from the fabrication you may have building codes etc. to comply with if you intend to place in in service.

Ditto Stan!

What are we trying to reduce the pressure of? Air, water, hydraulic fluid, or whatever, and from what higher pressure to what lower pressure? Is the pressure reduction fixed, or variable? Is it to be by a flow through device, by means of a bypass or bleed? What are the flows? Is it to be mechanical only or involve electrical, pneumatic or other actuators in its function? Oh my!

Don't you just love these open ended, ill defined questions?

LOL. Would'nt we all like to fabricate something for ourselves, and then call ourselves manufacturers!

Take two asprines, go to bed until you get over it.

What's the fluid, temperaure, inlet pressure and outlet pressure ? My boy, you'll be up against real competition.

Generally I agree with previous replies. PRV are not expensive devices that requires application engineering to use them properly. I suggest you spend your time on the use of valves in air and fluids and after 6 months of learning, if you still keen you may want to develop a PRV that works in the cavitation zone of a fluid, that is with a high delta P and small flow rate at high temperature.

People,

If the guy wants to build his own pressure reducer, I say let him. Maybe he wants to learn by doing, maybe he wants to do it just for the heck of it. If he's got the money, the time and the desire, then who am I to stop him.

If a group of students want to build a satellite, I don't see why a guy can't build a down-to-earth pressure reducer.

Sir,

and also it needs to be calibrated that alone is a hell of a job, it should comply with international and/or local codes, if its use is critical and safety is at risk pls don't try to use it.

I agree with everybody but inspite with everybody's warning you want to go ahead.

Simple - Take a plunger valve, attach a lever at 90 degree angle, weld weights with hook, sit with inlet/outlet gauge and start hooking the lever till you reach desired reduced pressure and "presto" you have designed and manufactured your pressure reducer. Copy in various combinations of valve sizes 1/2" thru 4" to start with and copy weights with hooks in umpteen nos for marketing.Send me 1 sample of each for marketing. Then send me one guy for each with a stool to sit and lift the lever by hand up & down to maintain reduced pressure. include cost of your pressure reducer + wages of each guy with each valve. Throw the price of the stool as complimentary.

Once you become a rich man with your brand name for your "pressure reducer" pay me 3% royalty.In the meanwhile just send me $1.00 for the adevice.

Take a piece of pipe and a hammer, and flatten the pipe with it until there is very little area remaining through which the process fluid can flow. Cheap and nasty, and it works.