PRESSURE RELIEF VALVE

PRESSURE RELIEF VALVE RECOMMENDED

BY ROBERT WARREN IN THE CHARLES 803

CONSTRUCTION MANUAL

Photo Courtesey of Nanda Warren

< SOURCE : CHARLES 803 CONSTRUCTION MANUAL PAGE 30 >

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DETAIL OF VALVE,

SHOWING ALL PARTS

AND THEIR RELATIVE SIZE.

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VALVE WITH STEM REMOVED

PLACED ON EDGE TO SHOW

THE VITON 'O' RING

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Pressure Relief ValveTest Rig

FOR THE BOILER VAPOUR OUTPUT PIPE

I BUILT THIS TEST RIG USING AN AUTOMATIC SELF INFLATING BLOOD PRESSURE MONITOR,
- BRAND : LIFESOURCE
- MODEL : UA-767
- DIGITAL BLOOD PRESSURE MONITOR
TO BLOW AIR TO CRACK THE VALVE OPEN.
THE MONITOR SHOWS THE PRESSURE IN MMHG,HERE THE VALVE OPENS AT 39 mm hg ( 39 TORR )

NOTE : THE PUMP IN THE BLOOD PRESSURE MONITOR PUMPS TO INFLATE THE ARM BAND.

BY DISCONNECTING THE TUBE
AND INSTALLING IT AT THE BASE OF THE CHECK VALVE,
THE PUMP BLOWS AIR THROUGH THE CHECK VALVE,
CRACKING THE VALVE OPENED.
THE AMOUNT OF PRESSURE NEEDED TO OPEN THE VALVE IS INDICATED ON THE MONITOR DISPLAY.
THE PUMP WILL RUN FOR ABOUT 1 MINUTE THEN, THE UNIT WILL INDICATE A FAULT. ( THE BAND IS MISSING )
TURN THE MONITOR OFF AND ON AGAIN FOR AS MANY TESTS AS NEEDED. Gilles

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TO MAKE THE TEST RIG : 1-2-3

USE AN AUTOMATIC SELF INFLATING BLOOD PRESSURE MONITOR ( THIS WILL NOT AFFECT YOUR MONITOR AND IT WILL REMAIN IN GOOD CONDITION, AFTER THE TESTS )
UNPLUG THE TUBE FROM THE ARM BAND
INSERT IT AT THE BASE OF THE CHECK VALVE, IN THE DIRECTION OF THE NORMAL FLOW OF THE LIQUID THROUGH THE VALVE.
TAPE IT TO COMPLEATELY SEAL OFF ANY POTENTIAL AIR LEAKS.

THIS TEST RIG IS VERY ACCURATE AND SIMPLE ENOUGH TO USE,

AND RELATIVELY INEXPENSIVE AS COMPARED TO A LAB SETUP.

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HERE I RISE THE PRESSURE
BY PRESSING ON THE VALVE SEAT
TO INCREASE ITS RESISTANCE TO 125 mm hg
THE EQUIVALENT RESISTANCE OF 2.5 Psi (2.42 Psi)
THIS IS THE RECOMMENDED MAXIMUM PRESSURE FOR SAFE USE OF A STANDARD 55 GALLON DRUM

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NOTE : 1 Psi = 51.72 mmhg ( 1mmhg = 0.01934 Psi )

! SAFETY ! SAFETY ! SAFETY !