RKL applications
Series LAF

Menu-Control Valves


  • Pre-pinched design provides linear flow characteristics
  • External stroke adjustment
  • Pneumatic and Electropneumatic positioners available
  • No packing to maintain or replace
  • Bi-directional, drop-tight shutoff

Materials of construction

  • ANSI Class 125/150
  • Cast-iron, aluminum or ductile iron body
  • Sleeve available in Pure Gum Rubber, Neoprene, Hypalon, Chlorobutyl, Buna-N, EPDM and Viton


The Series LAF pre-pinched control valve offers excellent linear flow characteristics. Precise control is easily obtained at valve openings from 15% to 80%. 

The smooth, unobstructed design of the RKL series LAF Pinch Valve provides very low restriction to the media flow path, reducing the possibility of unwanted turbulence and virtually eliminating plugging. Being a high recovery valve, the pinch valve contributes very little pressure loss to the system when in the full open position. 

Cavitation is a problem engineers often encounter when designing control systems. Although extremely detrimental to most metal valves, normal cavitation creates little difficulty for an RKLPinch Valve. The design of the valve and length of the sleeve reduce the possibility of cavitation. The pinched center portion of the sleeve tends to send cavitation liquid to the center of the flow stream long enough to prevent bubbles from impinging on the sleeve walls. The sleeve extends well past the vena contracta, confining cavitation to within the valve itself, thus reducing damage to companion piping. When severe cavitation does cause contact on the sleeve wall, the elastomer not only offers greater resistance to damage than most standard metals, but also helps to reduce vibration noise.

© 2014 RKL