THREAD SIZES - ROLLOVER VALVES AND THE ADJUSTABLE CONEJET

THREAD SIZES - ROLLOVER VALVES AND THE ADJUSTABLE CONEJET

THREADS (SKROEFDRADE) NPT, NPS, BSPT, BSPP

Let's clear up the issue of thread sizes; well at least these. Not everyone in the world has gone metric and it is unlikely that all countries will change even in decades to come.

Here we have an image of a rollover valve with slotted strainer, ceramic nozzle-tips and cap. Take note of the parallel inlet thread with lock nut.

This image shows a rollover valve with male inlet thread and a male hexagonal barrel nipple.

The inlet thread of the rollover is parallel (BSPP) while that of the nipple is tapered (BSPT).

BSPP = BRITISH STANDARD PARALLEL PIPE thread.

BSPT = BRITISH STANDARD PIPE TAPERED thread.

BSP or British Standard Pipe are standards in UK, (not much of a united kingdom anymore), Europe, Australia, New Zealand and South Africa.

And finally the Adjustable Conejet or "Superjet" as some refer to it with its external 1/2" (NPT) and internal 1/4" female (NPT) thread. 

NPT = NATIONAL PIPE TAPER thread. NPT is an American "standard". 

This unit is not manufactured with BSP threads!

You may also come across NPS -NATIONAL PIPE STRAIGHT thread which is the STRAIGHT or parallel form of the National Pipe Taper thread. Refer to page 70 in the Teejet 51A - M catalogue.

So! What's the difference? Quite simply the there is a slight difference in the shape of the thread. The pitch or number of threads per inch are the same.

Next post : UNIFIED NATIONAL - capnut thread.

INTL Mobile +27 83 289 0327

NATL MOBILE 083 289 0327

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