What size Coupling/Thread ?

[demented]

Anyone know the Coupling size of both sides of Clarke Ranger Compressor Shut of Valve/Tap (shown below) which, I want to replace but with a different Valve/Tap.

Within the Clarke User Manual it mentions 1/4BSP; so, I understood the smaller Male thread to be 1/4 BSP and the bigger end 3/8 BSP ?
The Male PCL Snap Connector, I assumed had 3/8 BSP male end ?


I've bought a 3/8 BPS double Female Shut off Valve and a Male 3/8 to 1/4 reducer, which are all too big; so trying to clarify size required before I re-order.

Any idea ?

 

[Ashley Burton]

BSP Thread Sizes = Actual sizes in Metric
1/4 =11.8mm
3/8 = 15.25 mm
1/2 = 19.00mm

Hope that helps

 

[demented]

Thanks for your reply and yeah, it's good to know the actual thread sizes and will come in handy no doubt; but it's the BSP size I'm trying to identify.

Thanks again

 

[MoreWellie]

@demented maybe you should read Ashleys post again

he has given you the metric equivalents for the outside threads of the common BSP connection sizes.

if you slap a mic (or a ruler) across the threads on your fittings these should help you identify your BSP thread sizes​

 

[carbon]

@Ashley Burton the sizes that you have quoted are tapping drill sizes rather than the male thread dimensions. Look for a male bsp thread chart for metric equivalents

 

[demented]

Thanks for replies and much appreciated..
As for measuring; the new valve and reducer are sealed in semi transparent plastics bags and as I'll be returning, either for a refund or exchange, I don't won't to open the bags.
Although I have photos on my phone, the original shut off valve and snap connectors are with the compressor in the garage and not with me.

I think I've worked it out though.
The smaller thread on the original shut off valve, dipicted in the photo and on the left, is actually 1/8 BSP.

So I require a 1/4 to 1/8 BSP Male Reducer and a Double Female 1/4 BSP Shut Off Valve.

 

[Ashley Burton]

@Ashley Burton the sizes that you have quoted are tapping drill sizes rather than the male thread dimensions. Look for a male bsp thread chart for metric equivalents

Yes you are correct!

My mistake, But those measurements will give you a good enough idea of which is which

 

[demented]

Yeah, that'll be good, if not too much trouble.

Although, I've just ordered a new 1/4 Female shut off valve and a 1/8 male reducer from Rs Components.

 

[merckx]

Have you noticed much of an improvement in reducing the compressor noise with the oil filter?

 

[brightspark]

I've installed a ball valve-connector assembly like below on a few compressors, this one had a 1/8 BSP outlet on the regulator. I make sure connectors and valve levers don't stick out, so cables, trousers etc. won't catch on them. I also replace the "drains" (or crud collectors rather) with 3/8 ball valves and a hose barb with about 1' garden hose, and add a cheap car oil filter as an intake filter.

For below assembly I used male/ female 1/8 BSP elbow> male/ male 1/8-1/4 adapter> female/male 1/4 ball valve> female 1/4 euro connector. I normally use whatever I have in the workshop, but this compressor followed me home recently from @Wozzaaah HQ, so I had to buy new fittings as I couldn't find any in the fridge!

pretty restricted air supply with those size fittings

 

[brightspark]

No, not on direct drive compressors. The pistons/ rings love it though!

This one, as many compressors, came with a 1/8 BSP outlet from the factory, the original tap had a bore of about 4-5mm I think. I don't see how my fittings, which all have a bigger bore, reduce the air supply?

there a poor idea from the factory . specially on air tools .the outlet filter regulator is small bore . its far better taking a larger bore filter reg directly off the end of the tank if there is a plug fitted which most have heres one of mine the other end of the tank has an outlet as well fitted with a half inch bsp filter regulator

 

[brightspark]

I use 15 mm bore pipe on my small blasting gear and 3/4 on the larger one. 3/8 th will be ok on the 3mm jet pot but 1/4 is noticeably more restricted on cfm and loss of power

 

[brightspark]

they will be fine on suction guns. but pressure pots use a fair bit of cfm I have a suction gun as well . used an original one as a pattern and cast it in aluminium and knocked one up

 

[demented]

melle.... Thanks for the photos and the insight, food for thought, I didn't think of adding the elbow; will now.
Yeah, current outlet protrudes too much, hence why I'm replacing, due to similar experience as yourself.

 

[demented]

If of interest; the final product fitted, complete with compact elbow.

I would have preferred the Tap be Red rather than Green but suppose I could paint it.

 

[carbon]

May be a daft question but what’s the need for a tap/ valve as the quick release coupling is self sealing. Brightspark needs the valve as his couplings don’t self seal

 

[demented]

@carbon, as for the Tap, the compressor came with one as standard, which looked fragile, so I just replaced it with one which was more robust but now you've pointed it out and due to the Quick Release Coupling, maybe I didn't need it.

@melle, yeah, I can have it pointing down but it's much easier to connect to in the slightly upright position; is there any reason why you'd prefer to have it pointing downwards ?

 

[demented]

@melle, I've pointed the valve towards the compressors tubular handle, which kinda sheilds it and I don't do that much grinding but thanks for your insight.

 

[carbon]

I use Euro couplings, which are supposed to be self sealing but always hiss. My father in law's compressor has PCL fittings, which are hardly any better.

I used to have that issue with the genuine pcl female couplings. I now have a mixture of 'pcl' and euro fittings but Im using rectus couplings now without any issues

 

[Ashley Burton]

This thread is starting to remind me about when I did a drain extension on my compressor...

Problem sorted:
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