Item # 5120B-1M, Popoff Relief Valve On Circle Valve Technologies Inc.

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=CASE WHEN ISNUMERIC({Cracking Pressure Setting1})=1 THEN {Cracking Pressure Setting1} + {Base Price} WHEN ISNUMERIC({Cracking Pressure Setting1})=0 THEN {Base Price} END=

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Features

Zero leakage up to 95% of cracking pressure
Positive reseat at high percentage of cracking pressure
Accurate set pressure
Wide range of cracking pressure
Tamper-proof adjustment
PED certifications and CE marking available for most models

Note:
Proper filtration is recommended to prevent damage to sealing surfaces.
Repair Kit:
In normal service, the only part(s) which may require replacement is(are) the seal(s). A repair kit may be ordered by placing a ‘K/’ in front of the complete part number (i.e. K/5159B–2MP–20).
1/8" size: for cracking pressure 1201–2400 psig, ‘M’ is 3.58, ‘G’ is 2.48, ‘B’ and ‘H’ are 1.00 1 1/4" size: not available above 1200 psig

Unit of Measure

Specifications | Reseal Pressure and Leakage

Specifications

Series	N/A 5100
Body Material¹	N/A Brass
O-Ring Material	N/A Teflon®
Valve Size	N/A 1/8 in
End Connections (Inlet/Outlet)	N/A Male pipe
Operating Pressure	N/A 20 to 2400 psig1.4 to 165 bar
Cracking Pressure	N/A 20 to 2400 psig
Operating Temperature	N/A -100 to 400 ºF
Cracking Pressure Tolerance²	N/A ±5%
Weight	N/A .29 lbs

Reseal Pressure and Leakage

N/A

Reseal Pressure
The reseal point is the point at which the valve seals absolutely tight so that there is no leakage detectable by normal means of measurement. The point at which the valve closes, cutting off virtually all flow, is called the reseat point. The reseat point is substantially above the reseal.

	Crack Pressure	Reseal Pressures
Elastomeric seals	C.P. > 100 psi	90% of C.P.
	C.P. <100 psi	70% to 89% of C.P.
Teflon® seals	C.P. > 450 psi	90% of C.P.
	C.P. < 450 psi	52% to 90% of C.P.

Leakage at reseal pressure

Elastomeric seals	Ascending pressure = zero up to 95% of cracking pressure
	Descending pressure = zero at reseal and below
Teflon® seals	Ascending pressure = zero up to reseal pressure, then 10cc/min between reseal and cracking pressure
	Descending pressure = zero at reseal, except with cracking pressure below 451 psi, then 1cc/min maximum

First crack pressure after standing unactuated for a prolonged period

Set pressure of?	5-19 psi	125% of cracking pressure
	20-29 psi	120% of cracking pressure
	30-49 psi	115% of cracking pressure
	50 psi and higher	110% of cracking pressure

¹ For PED applications, brass bodies are limited to a maximum temperature of +100°F (+38°C)
Steel is not available for PED applications.
² Cracking pressures below 20 psig have a tolerance of ±20%.

Specifications

Series

O-Ring Material

Valve Size

End Connections (Inlet/Outlet)

Operating Pressure

Cracking Pressure

Operating Temperature

Weight

Reseal Pressure and Leakage