Page 91 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

Fluid Flow 75

STOP-CHECK VALVES FOOT VALVES WITH STRAINER
(Globe and Angle Types)
Poppet Disc Hinged Disc
6J

If: If:
{3 = I ... K1 • 400 / T {3 - I K1 - 200 fr K-420/r K-1,fr
{3 < 1 .. :K2 - Formula 7 {3 < 1 Ks - Formula 7
Minimum pipe velocity Minimum pipe velocity
Minimum pipe velocity Minimum pipe velocity (fps) for full disc lift (fps) for full disc lift
for full disc lift for full disc lift -15-VV -JS vv
• 55 {3 vv - 7' (32 v'v
2

BALL VALVES

If: If:
{3 = I K1 - J 50 fr {3 - 1 K1 .. 3oofr
{3 < 1 K2 = Formula 7 {3 < 1 K2 - Formula 7
r f: {3 - I, 8 - 0 K1 = J fr
Minimum pipe velocity (fps) for full disc lift {3 < 1 and 8 � 45° K2 � Formula s
-6ofP vv {3 < 1 and 8 > 45°:.:: 180° K2 - Formula 6

BUTIERFL Y VALVES

If: If:
/J � I K1 - 55 fr {3 - 1 K1 = 55 Jr
{3 < 1 K2 - Formula 7 {3 < 1 K2 � Formula 7
Sizes 2 to s• K - 45 fr
Minimum pipe velocity (fps) for full disc lift Sizes 10 to 14• K - 35 fr
• 140 {3 V\f Sizes 16 to 1.4• K - 25 fr
2

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