RKL Controls

Series LEF Electrically Actuated Control Valve

RKL Controls • 700 North Bell Avenue, Carnegie, PA 15106 • 412-249-0030 • Fax 412-249-0031 • www.redvalve.com/rklcontrols (#012-02)

The Series LEF pre-pinched control valve offers excellentlinear flow characteristics. Precise control is easily obtainedat valve openings from 15% to 80%.

The smooth, unobstructed design of the Series LEF pinchvalve provides very low restriction to the media flow path,reducing the possibility of unwanted turbulence and virtuallyeliminating plugging. Being a high recovery valve, the pinchvalve contributes very little pressure loss to the system whenin the full open position.

Cavitation is a problem engineers often encounter whendesigning control systems. Although extremely detrimentalto most metal valves, normal cavitation creates little difficul-ty for an RKL Pinch Valve. The design of the valve andlength of the sleeve reduce the possibility of cavitation. Thepinched center portion of the sleeve tends to send cavitationliquid to the center of the flow stream long enough to preventbubbles from impinging on the sleeve walls. The sleeveextends well past the vena contracta, confining cavitation towithin the valve itself, thus reducing damage to companionpiping. When severe cavitation does cause contact on thesleeve wall, the elastomer not only offers greater resistanceto damage than most standard metals, but also helps toreduce vibration noise.

The high CV rating, usually 80% of straight-through pipe,offers the opportunity to use a smaller, less expensive valvein many instances.

P Pre-pinched design provides linearflow characteristics

P Available with a choice of electric actuators

P No packing to maintain or replace

P Split housing for easy sleeve replacement

P Long cycle life

P Throttling or on/off service

Materials of ConstructionP ANSI Class 125/150

P Cast-iron, aluminum or ductile-iron body

P Sleeve available in Pure Gum Rubber,Neoprene, Hypalon®, Chlorobutyl, Buna-N, EPDM and Viton®

CV valve for reduced port valve is the same, regardless of whether thereduction is accomplished by the use of reducers, by a taper built into therubber sleeve, or a combination of both.

=

4 x 2 RubberPinch Sleeve

2 Pinch Valve 4 x 2 Reducer

4 Pipe

RKL Controls has long been recognized in the pinchvalve market for its leadership in the manufacture ofengineered control valves. RKL successfully engi-neers pinch valves with all the pneumatic and elec-tronic instrumentation required in today’s modernautomated process industries.

One of the most critical areas in modulating controlvalve applications is selecting the correct valve sizefor optimum and efficient control. Complete sizingdata and calculations are available by requesting thenew “RKL Control Pinch Valve Sizing Handbook.”CV and FL figures in the sizing handbook weredetermined through laboratory research and testing.Current ISA and Fluid Controls Institute Standardsand Procedures were employed to determine valvesizing constants and formulae.

LEF pinch valve housings are available in cast ironor aluminum, with ductile iron specific as an option.The valve stem and actuator stem are 303 stainlesssteel, and the pinch bar is solid cold rolled steel.Optional epoxy and PVC coatings are available at asmall charge for extremely corrosive atmospheres.

LW

Valve Dimensions

1 6 5 1/4 14 5 2001 1/2 6 6 1/8 15 6 200

2 8 7 30 13 2002 1/2 10 8 7/8 38 17 175

3 12 10 1/4 50 24 1754 16 12 1/8 100 45 1505 15 13 1/4 160 74 1256 18 15 7/8 160 74 1258 24 18 3/4 260 141 125

10 30 22 1/2 385 190 10012 36 27v 620 311 10014 42 29 825 450 7516 48 33 3/4 1400 680 75

WeightCast Weight Working

Valve Length Width Iron Aluminum PressureSize L W lbs lbs psi

Electric actuators are available from a variety ofmanufacturers. The standard RKL package includesan AUMA actuator, complete with torque and travellimit switches, remote and local operation withpushbuttons and a NEMA-4 enclosure.

Sleeves are available in most elastomers to ensuremaximum possible life in any combination of abra-sive or corrosive applications. Options include adouble-wall sleeve for increased abrasion resistanceand a new cone sleeve for better throttling control.

Complete systems for very special customer require-ments can be designed by the RKL engineeringdepartment to meet exact specifications.

The only maintenance required is routine lubricationof the operator and valve stem. RKL Series LEFpinch valves are capable of extremely long cyclinglife, and replacement of the elastomeric sleeve issimple and inexpensive.

RKL Controls • 700 North Bell Avenue, Carnegie, PA 15106 • 412-249-0030 • Fax 412-249-0031 • www.redvalve.com/rklcontrols (#012-02)

Overall height is determined by actuator selection. Please consult factory.

Consult Factory