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127F-27855-10
6. VB-8/9000 Valve and
Actuator Assemblies
3-Way Globe Valve Assemblies with Pneumatic Spring Return Actuators
Spring Return
3-Way Globe Valve Assemblies
(shown with Positive Positioner)
MK-6811
b
MK-6911
b
Actuator Models (Actuator Codes)
MK- 6 811 (602) MK-6911 (652)
Linkage Kit Part Number
AV-497 AV-497
Spring Range, psig (kPa)
5…10 (34 to 69)
a
5…10 (34 to 69)
a
Close-off Pressure (psi)
35
Valve Assembly
Part Number
b
P
Code
Valve
Size in.
C
v
c
k
vs
c
Maximum Allowable Operating Differential
Pressure
d
, psi (kPa) (Mixing/Diverting)
VK-8303 - 602-5 -12
12 2½
80
e
69
e
35 (240) / 35 (240)
-
95
f
82
f
115
g
99
g
VK-8303 - 602-5 -13
13 3
110
e
95
e
120
f
104
f
120
g
104
g
VK-8303 - 602-5 -14
14 4 190
h
164
h
VK-8303 - 602-5 -15
VK4-8303-602-5-15
15 5 290
h
251
h
-
VK4-8303-652-5-16
16 6 500
h
433
h
- 35 (240) / 35 (240)
VB-82x3 3-Way Valves with
Pneumatic SR Actuators
3-Way Valves
Note: Choose a valve assembly with a maximum operating differential pressure capability sufficient for the application. Not all actuator and valve
body combinations are offered as factory assemblies.
a - Spring range field adjustable with positive positioner.
b - AK-42309-500 positive positioner optional for 2½”…5” valve, required for 6” valve. Supplied as standard on VK4 factory valve assemblies. See “Pg. 98,
Assembly Ordering VB-8/9000 for the relevant part series to determine a specific part number.
c -
C = gpm
∆P
v
(where ∆P is measured in psi) kvs = Cv / 1.156
K = m /h
∆
P
vs
3
(where ∆P is measured in bar; 1 bar = 100 kPa).
d - Maximum allowable differential across the valve in any open position. Less than 20 psi recommended for quieter service. Consult close-off
pressure ratings.
e - Mixing configuration, ports A and B are inlets, AB port is outlet.
f - Diverting configuration, flow AB to A port.
g - Diverting configuration, flow AB to B port.
h - All flow configurations, mixing or Diverting.
6. VB-8/9000 Valve and
Actuator Assemblies