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Series-WE20Configuration
Butterfly Valves with Cartridge Seat for Low Torque Seal, Gas/Liquid Control
- Cartridge-style seat design ensures low torque operation and easier service vs traditional dovetail seats
- Available in wafer or lug body styles (2″-12″) with EPDM or PTFE liners for broad fluid compatibility
- Suitable for manual, electric or pneumatic actuation configurations-highly configurable for your control needs
- Dual flange patterns (ANSI Class 125 & 150) with extended neck for insulation-designed for both shut-off and throttling applications
Product Overview
- Series ID Series-WE20
Supported Applications
The Dwyer Series WE20 Butterfly Valve is designed for liquid, gas, and steam control. The series utilizes a cartridge seat design to maintain consistent low torque operation independent of flange support, enabling full rated dead end service. Documented applications include petroleum, petrochemical, hydroelectric power plants, waste treatment, and pneumatic conveying systems.
Operating Conditions & Performance
The valve body is constructed from ductile iron with a 316 SS disc and Nylatron bearings. Wetted materials include EPDM or PTFE seats and an EPDM O-ring; the stem is 410 SS. The series supports line sizes from 2" to 12" with lug or wafer end connections designed for flanges that are ANSI Class 125 (B16.1) and ANSI Class 150 (B16.5). Pressure limits are rated at 225 psi (15.5 bar).
Process temperature ranges depend on the seat material: EPDM seats support -50 to 250°F (-46 to 121°C), while PTFE seats support 0 to 300°F (-18 to 149°C). Ambient operating temperatures vary by actuator type. Electric actuators operate from -22 to 140°F (-30 to 60°C); pneumatic actuators operate from -40 to 176°F (-40 to 80°C).
Configuration Options
The Series WE20 is configurable with manual, electric, or pneumatic actuation. Actuators are directly mounted for compact assembly.
- Manual Operation: Sizes 2" to 6" use a 10-position locking hand lever; sizes 8" to 12" utilize a manual gear operator.
- Pneumatic Actuators: Available as double acting (DA series) or spring return (SR series). Double acting models require air supply for both opening and closing. Spring return models use air to open with internally loaded springs returning the valve closed; normal operation is fail-closed, though racks can be rotated 180° for reverse operation. Normal supply pressure ranges are DA: 40 to 115 psi (2.7 to 7.9 bar) and SR: 70 to 115 psi (4.8 to 7.9 bar), with a maximum of 120 psi (8.6 bar). Air connections for models DA03 through DA11 and SR03 through SR11 are 1/4" FNPT.
- Electric Actuators: Offered in two-position or modulating control. Modulating actuators accept a 4-20 mA input. Power requirements include 110 VAC, 220 VAC, 24 VAC, and 24 VDC (MD models not available in 24 VDC). Enclosure ratings are NEMA 4X (IP67) for TD/MD series and NEMA 7 for TH/MH series. The NEMA 7 rating is designed to meet hazardous locations: Class I, Group C & D; Class II, Group E, F & G; Division I & II.
- Accessories: Limit switches can be mounted directly to the valve for remote position indication (standard on TD and TH/MH models). The SV3 solenoid valve is available to electrically switch air supply pressure. Additional accessories include AFR4 air filter regulators, R2-2120 regulators, and VB-01 volume boosters.
Key Product Differences
The series distinguishes between body styles (lug or wafer) and seat materials (EPDM or PTFE). Electric actuator families differ by enclosure rating: TD/MD models provide NEMA 4X weatherproof protection, while TH/MH models offer explosion-proof ratings for hazardous locations. Pneumatic actuators are categorized as double acting (DA) requiring dual air supply ports, or spring return (SR) utilizing internal springs to fail closed upon loss of pressure.
Accessories
accessories
Show Ratings & Reviews
WE20-X-X-XXX-OPT WE20 ELECTRIC BUTTERFLY VALVE
1ST SYMBOL (1ST X) RANGE
ATD02 2 IN ELECTRIC TWO-POSITION
BTD02 2-1/2 IN ELECTRIC TWO-POSITION
CTD02 3 IN ELECTRIC TWO-POSITION
DTD03 4 IN ELECTRIC TWO-POSITION
ETD04 5 IN ELECTRIC TWO-POSITION
FTD04 6 IN ELECTRIC TWO-POSITION
GTD05 8 IN ELECTRIC TWO-POSITION
HTD06 10 IN ELECTRIC TWO-POSITION
ITD07 12 IN ELECTRIC TWO-POSITION
AMD02 2 IN ELECTRIC MODULATING
BMD02 2-1/2 IN ELECTRIC MODULATING
CMD02 3 IN ELECTRIC MODULATING
DMD03 4 IN ELECTRIC MODULATING
EMD04 5 IN ELECTRIC MODULATING
FMD04 6 IN ELECTRIC MODULATING
GMD05 8 IN ELECTRIC MODULATING
HMD06 10 IN ELECTRIC MODULATING
IMD07 12 IN ELECTRIC MODULATING
ATH03 2 IN EXP ELECTRIC TWO-POSITION
BTH03 2-1/2 IN EXP ELECTRIC TWO-POSITION
CTH05 3 IN EXP ELECTRIC TWO-POSITION
DTH05 4 IN EXP ELECTRIC TWO-POSITION
ETH06 5 IN EXP ELECTRIC TWO-POSITION
FTH08 6 IN EXP ELECTRIC TWO-POSITION
GTH09 8 IN EXP ELECTRIC TWO-POSITION
HTH10 10 IN EXP ELECTRIC TWO-POSITION
ITH11 12 IN EXP ELECTRIC TWO-POSITION
AMH03 2 IN EXP ELECTRIC MODULATING
BMH03 2-1/2 IN EXP ELECTRIC MODULATING
CMH05 3 IN EXP ELECTRIC MODULATING
DMH05 4 IN EXP ELECTRIC MODULATING
EMH06 5 IN EXP ELECTRIC MODULATING
FMH08 6 IN EXP ELECTRIC MODULATING
GMH09 8 IN EXP ELECTRIC MODULATING
HMH10 10 IN EXP ELECTRIC MODULATING
IMH11 12 IN EXP ELECTRIC MODULATING
2ND SYMBOL (2ND X) BODY TYPE AND LINER OF BUTTERFLY VALVE
WE WAFER EPDM
WP WAFTER PTFE
LE LUG EPDM
LP LUG PTFE
3RD SYMBOL (3RD X) ACTUATOR VOLTAGE (ELECTRIC ACTUATORS)
N NO SOLENOID
A 110 VAC
B 220 VAC
C 24 VAC
D 24 VDC
WE20-X-X-XXX-OPT WE20 PNEUMATIC BUTTERFLY VALVE
1ST SYMBOL (1ST X) RANGE
AHD00 2 IN HAND OPERATED
BHD00 2-1/2 IN HAND OPERATED
CHD00 3 IN HAND OPERATED
DHD00 4 IN HAND OPERATED
EHD00 5 IN HAND OPERATED
FHD00 6 IN HAND OPERATED
GHD00 8 IN HAND OPERATED
HHD00 10 IN HAND OPERATED
IHD00 12 IN HAND OPERATED
ADA03 2 IN DOUBLE ACTING
BDA03 2-1/2 IN DOUBLE ACTING
CDA04 3 IN DOUBLE ACTING
DDA05 4 IN DOUBLE ACTING
EDA06 5 IN DOUBLE ACTING
FDA07 6 IN DOUBLE ACTING
GDA08 8 IN DOUBLE ACTING
HDA09 10 IN DOUBLE ACTING
IDA11 12 IN DOUBLE ACTING
ASR04 2 IN SPRING RETURN
BSR04 2-1/2 IN SPRING RETURN
CSR06 3 IN SPRING RETURN
DSR07 4 IN SPRING RETURN
ESR08 5 IN SPRING RETURN
FSR09 6 IN SPRING RETURN
GSR10 8 IN SPRING RETURN
HSR11 10 IN SPRING RETURN
ISR11 12 IN SPRING RETURN
2ND SYMBOL (2ND X) BODY TYPE AND LINER OF BUTTERFLY VALVE
WE WAFER EPDM
WP WAFTER PTFE
LE LUG EPDM
LP LUG PTFE
3RD SYMBOL (3RD X) SOLENOID (PNEUMATIC ACTUATOR ONLY)
N NO SOLENOID
A NEMA 4X NAMUR SOLENOID
4TH SYMBOL (4TH X) SOLENOID VOLTAGE (PNEUMATIC ACTUATOR ONLY)
NO SYMBOL FOR ELECTRIC ACTUATORS
N NO SOLENOID
A 110 VAC
B 220 VAC
C 24 VAC
D 24 VDC
E 12 VDC
OPTIONS (OPT) (PNEUMATIC ACTUATORS ONLY)
-NO FAIL OPEN SPRING RETURN ACTUATOR