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VFF2
Resilient seat two-way valves
provide control for HVAC system
applications including chilled
water, hot water, cooling tower
water, thermal storage systems,
and steam.
SPECIFICATIONS
Body Pattern ........................................2 way (NC, NC/NO; NSR)
Valve Action .........................................Normally Closed, convertible
to Normally Open with Spring
Return DCA
Connection Type ..................................Lugged
Controlled Medium ............................... Chilled and hot water, up to
50% glycol
Actuator Control Type ..........................Electric floating, and
modulating; pneumatic spring
and non-spring return
Type of Enclosure ................................. NEMA 2 housing, DCA,
NEMA 4 industrial electric,
pneumatic linear
Flow Characteristic ..............................Modified Equal Percent
Mounting ..............................................ANSI Flanged
Static Pressure Rating (max) ................250 psi (1724 kPa)
Maximum Differential Pressure Ratings
(Close-off) ............................................175 psi (1206 kPa)
Actuator Ambient Temperature Ratings -5 F to 140 F (-20 C to 60 C)
Temperature Range .............................-40 F to 250 F (-40 C to 121 C)
Materials
(Body) ..................................................Polyester-coated cast iron
ASTM A126 Class B
(Stem) ................................................... 416 stainless steel
(Seat) .................................................... Peroxide-cured EPDM resilient
seat
(Plug/Ball/Disc) ....................................Nylon 11-coated ductile iron
APPROVALS
CE ........................................................Compliant
Underwriters Laboratories, Inc. ........... C/US UL873, Plenum Rated
DIMENSIONS DIAGRAM
M27011
D
R
G
T
R
F
L1
L2
W
H
NEMA 4X ACTUATORS ARE WATERPROOF AND CORROSION-RESISTANT.
1
PIPE SIZE
IN. [mm]
W H1 L1 L2 G W H1 L1 L2 G
2
[DN50]
2-1/2
[DN65]
3
[DN80]
4
[DN100]
7-1/2 6-3/4 5-1/2 2 5-3/4
5
[191] [170] [141] [51] [147]
[DN125]
6
[DN150]
8
[DN200]
10
[DN250]
12
[DN300]
14
[DN350]
16
[DN400]
18
[DN450]
8-1/2 16 8-3/4 4-1/2 12-1/2
20
8-1/2 16 8-3/4 4-1/2 12-1/2
[DN500]
[217] [406] [221] [115] [320]
* 175 PSI [1206 KPA] CLOSE-OFF UP TO 12 INCHES [DN 300], 150 PSI [1034 KPA] OTHERWISE
[51]
[147]
7-1/2
[191]
5-3/4
[141]
[81]
[241]
7-3/4
12-1/8
[307]
[217]
[188]
[198]
12-1/8
8-3/4
8-7/8
7-3/8
2-3/4
8-1/8
7-3/8
2-3/4
[68]
[198]
[68]
NEMA 4X (VFF2_W1YXA/B)
5-1/2
6-3/4
[170]
2
10-1/8
[257]
[406]
[224]
8-1/8
[206]
NEMA 4 (VFF2_W1Y4A/4B)
3-1/4
[221]
[115]
[320]
9-1/2
[226]
7-3/4
UNDER CUT DISK, 50 PSI CLOSE-OFF**
**NOTE: VALVE SIZES 2 TO 3 INCHES HAVE 175 PSI [1206 KPA] CLOSE-OFF AND ARE
AVAILABLE ONLY WITH FULL CUT DISKS.
FULL CUT DISK, HIGH CLOSE-OFF*
3-1/4
9-1/2
[257]
[206]
[188]
[307]
[224]
[226]
[81]
[241]
8-7/8
NEMA 4X (VFF2_V1YXA/B)
NEMA 4 (VFF2_V1Y4A/4B)
10-1/8
8-3/4
WITH NEMA 4/4X ACTUATORS
Resilient Seat Butterfly Valves
VFF2