Tilting Disc Check Valves - Sizing and Pressure Drop

Valve Sizing

The chart below allows you to size a valve to give a specific pressure drop against a given flow rate of water. However, for air, steam, gases or other liquids you should consult our Sales Office for the sizing of Tilting Disc Check Valves.

Northvale has invested in computer aided design facilities and to this extent we can size valves for your applications and give accurate predictions of pressure drops etc. as such we require the following information:

Preferred units shown
FLUID	LIQUID	GAS	STEAM
NAME
FLOWRATE	m3/hr	kg/hr	kg/hr
INLET PRESSURE	bar g	bar g	bar g
PRESSURE DROP MAX.	bar	bar	bar
TEMPERATURE	°C	°C	°C
SG	water=1	air=1	-
VALVE ORIENTATION
LINE SIZE	mm	mm	mm

Oversize Valves

Oversized valves should not be used as this causes the disc to flutter and will quickly wear out the spindle bearings.

The lines a to d on the graph below represent the point at which the valve attains its fully open position and therefore its correct sizing for its relative installation orientation.

a. Horizontal line with spring
b. Vertical line with spring
c. Horizontal line without spring
d. Vertical line without spring

Leakage Rate

The Tilting Disc Check Valve, when supplied, has an intended maximum leakage rate through the body/disc seating area of 1 cm3 per minute irrespective of valve size. This meets the requirements laid down for this test under API 598 and ANSI B16.34/MSS SP-61.

Conversions
1 m water guage	3.28	feet water guage
	1.42	psi
	0.098	bar
1 m3/hr water	0.28	litres/sec
	3.66	igpm
	0.59	ft3/min

Introduction | PN 25-40-100 Class | ANSI 150-300 | Limitations | Certification | Sizing & Pressure Drop