Series WE20 Butterfly Valve
Specifications - Installation and Operating Instructions
Bulletin V-WE20
The
Series WE20 Butterfly Valve
is offered in lug or wafer body styles and is equipped
with a PTFE or EPDM liner. The most critical aspect of the Series WE20 Butterfly
Valves is the cartridge seat design, which alleviates installation problems associated
with common “dove tail design” seats. Valve torques are lower and more consistent
as the seat dynamics are not dependent on being coupled between two flanges.
Precision machining of the disc and body allow the cartridge design to maintain a
tighter disc to seat tolerance, providing a perfect low torque seal each and every time
the valve is cycled. The seat to disc seal is independent of flange support and capable
of full rated dead end service.
Actuators are directly mounted creating a compact assembly for tight spaces. Limit
switches are able to be mounted directly to the valves allowing for remote position
indication.
The Series WE20 can be configured with either an electric or pneumatic actuator.
Electric actuators are available in weatherproof or explosion-proof, a variety of supply
voltages and two-position or modulating control. Two-position actuators use the supply
voltage to drive the valve open or closed, while the modulating actuator accepts a
4-20 mA input for valve positioning. Actuators feature thermal overload protection and
permanently lubricated gear train. The pneumatic double acting actuator uses an air
supply to drive the valve open and closed. The actuator has two supply ports, with one
driving the valve open and the other driving the valve closed. Spring return pneumatic
actuators use the air supply to open the valve, and internally loaded springs return the
valve to the closed position.
The pneumatic double acting actuator uses an air supply to drive the valve open
and closed. The actuator has two supply ports with one driving the valve open and
the other driving the valve closed. Spring return pneumatic actuators use the air
supply to open the valve and internally loaded springs return the valve to the closed
position. Also available is the SV3 solenoid valve to electrically switch the air supply
pressure between the air supply ports for opening and closing the valve. Actuators
are constructed of anodized and epoxy coated aluminum for years of corrosion free
service.
SPECIFICATIONS
VALVE
Service:
Compatible liquids, gases, and
steam.
Body:
2-way, wafer or lug butterfly.
Line Sizes:
2 to 12˝.
End Connections:
Lug and water
pattern designed for flanges that are
ANSI Class 125 (B16.1) and ANSI Class
150 (B16.5) dimension.
Pressure Limits:
225 psi (15.5 bar).
Wetted Materials:
Body Material: Ductile
iron; Disc: 316 SS; Seat: EPDM or
PTFE; O-ring: EPDM; Stem: 410 SS.
Temperature Limits:
Disc: EPDM:
-50 to 250°F (-46 to 121°C); PTFE: 0 to
300°F (-18 to 149°C).
Bearings:
Nylatron.
Operator:
2 to 6˝ 10-position locking
hand lever; 8 to 12˝: manual gear.
ACTUATORS
Pneumatic “DA” and “SR” Series
Type:
DA series is double acting and
SR series is spring return (rack and
pinion).
Normal Supply Pressure:
DA: 40 to
115 psi (2.7 to 7.9 bar); SR: 70 to 115 psi
(4.8 to 7.9 bar).
Maximum Supply Pressure:
120 psi
(8.6 bar).
Air Connections:
DA03 to DA11: 1/4˝
FNPT; SR03 to SR11: 1/4˝ FNPT.
Housing Material:
Anodized aluminum
body and epoxy coated aluminum end
caps.
Temperature Limits:
-40 to 176°F (-40
to 80°C).
Accessory Mounting:
NAMUR
standard.
Electric “TD” and “MD” Series
Power Requirements:
110 VAC, 220
VAC or 24 VAC.
Power Consumption:
See page 9.
Cycle Time (per 90°):
TD01 and MD01:
4 s; TD02 and MD02: 20 s; TD03 and
MD03: 30 s; TD04 and MD04: 30 s;
TD05 and MD05: 30 s; TD06 and
MD06: 45 s; TD07 and MD07: 30 s.
Duty Rating:
85%.
Enclosure Rating:
NEMA 4X (IP67).
Housing Material:
Powder coated
aluminum.
Temperature Limits:
-22 to 140°F (-30
to 60°C).
Electrical Connection:
1/2˝ female NPT.
Modulating Input:
4-20 mA.
Standard Features:
Manual override,
position indicator, and TD models come
with two limit switches.
Electric “TH” and “MH” Series
Power Requirements:
110 VAC, 220
VAC, 24 VAC or 24 VDC.
Power Consumption:
See page 9.
Cycle Time (per 90°):
See page 9.
Duty Rating:
See page 9.
Enclosure Rating:
NEMA 7, designed
to meet hazardous locations: Class I,
Group C & D; Class II, Group E, F & G;
Division I & II.
Housing Material:
Powder coated
aluminum.
Temperature Limits:
-22 to 140°F (-30
to 60°C).
Electrical Connection:
1/2˝ female NPT.
Modulating Input:
4-20 mA.
Standard Features:
Position indicator
and two limit switches.
WE20-CHD00-LE
WE20-EDA06-LE
WE20-CDA04-WP-AA07
WE20-ETD04-LE-A
WE20-CDA04-WP-NN08
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219-879-8000
Fax: 219-872-9057
www.dwyer-inst.com
e-mail: [email protected]
