Dwyer 蝶阀 WE20系列

The Series WE20 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.

规格规格

SPECIFICATIONS VALVE
Service    Compatible liquids, gases, and steam.
Body    2-way, wafer or lug butterfly.
Line Sizes    2 to 12".
End Connections    Lug and wafer pattern designed for flanges that are ANSI Class 125 (B16.1) and ANSI Class 150 (B16.5) dimension.
压力范围    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 thru DA11: 1/4" FNPT; SA03 thru 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 instruction manual.
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 to 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 instruction manual.
Cycle Time (per 90°)    See instruction manual.
Duty Rating    See instruction manual.
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.
温度范围    -22 to 140°F (-30 to 60°C).
Electrical Connection    1/2" female NPT.
Modulating Input    4 到 20 mA.
Standard Features    Position indicator and two limit switches.