[herbiefatboy]

hi all can any one tell me the diferance between a gate valve and a reed valve any help would be great thanks.

[spongebob]

Reed valves are controlled by pressure on one side of a flap causing it to open. Either a fluid or vacuum is involved. Higher one side than the other in pulsating fashion causing it tto open and shut frequently on demand.
A gate valve is simply a manually or electrically operated screw turn valve that is opened from fully closed to fully open with a guillotine type motion.Usually found with a red wheelhead in your airing cupboard pipework.
Why?

[herbiefatboy]

thanks but what one is best for a 4040 r.o thanks

[SPE]

thanks but what one is best for a 4040 r.o thanks

I use a gate valve on my 4040 waste and a t section before it with additional pipe work that bypasses the gate valve and then joins the waste pipe after with another t section. The bypass section has a gas tap on it. This way you can set the gate valve just the once to its optimum waste setting for your ro production, and then you simply open the gas tap to flush all water to waste and close it to produce pure.
Phil at vyair suggested this to me, all the 4040 systems he sells are set up this way.
Simon

[Spruce]

thanks but what one is best for a 4040 r.o thanks

I use a gate valve on my 4040 waste and a t section before it with additional pipe work that bypasses the gate valve and then joins the waste pipe after with another t section. The bypass section has a gas tap on it. This way you can set the gate valve just the once to its optimum waste setting for your ro production, and then you simply open the gas tap to flush all water to waste and close it to produce pure.
Phil at vyair suggested this to me, all the 4040 systems he sells are set up this way.
Simon

good idea

[herbiefatboy]

sorry but what does a gas tap look like

[SPE]

sorry but what does a gas tap look like

gas tap
http://www.toolstation.com/shop/Plumbing/Gas%20Fittings/Gas%20Mini%20Ball%20Valve/d20/sd2700/p92196
gate valve
http://www.toolstation.com/shop/Plumbing/Valves/Gate%20Valve/d20/sd2696/p83818

[SPE]

hopefully you can see the pic,
this is how I have set up my 4040 ro on Phil's (vyair) advice,the valve on the right is the gate valve and is already set to the optimum waste to pure ratio and the valve on the left (bypass) is the gas tap, its open in the pic, so all the water is flushing to waste, if I turned it fully anticlockwise a1/4 of a turn or 90 degrees it would be closed and I would be producing approx. 50/50 waste/ pure.
Hope thats helped you out.
Simon

[SPE]

You obviously dont need to use the plumbing fittings I have, my ro is in the hallway of my flat and as I have neighbours below me I have to ensure it is permanently plumbed in and all fittings are leak free, but the principle remains the same whatever fittings or valves you use.

[one eyed window cleaning]

hopefully you can see the pic,
this is how I have set up my 4040 ro on Phil's (vyair) advice,the valve on the right is the gate valve and is already set to the optimum waste to pure ratio and the valve on the left (bypass) is the gas tap, its open in the pic, so all the water is flushing to waste, if I turned it fully anticlockwise a1/4 of a turn or 90 degrees it would be closed and I would be producing approx. 50/50 waste/ pure.
Hope thats helped you out.
Simon

Nice job ! But expensive ?

[SPE]

Nice job ! But expensive ?

not really, to be honest. Had some copper pipe so was only a quick drawing and list of bits I needed and a trip to toolstation, forget how much now but about £20 ish.
Took longer to put it all together 

Suppose you could do it with plastic tubing and jg push fittings too if you could find similar types of suitable taps.