Straight Through KB Diaphragm Valve

The KLEP Straight Through Diaphragm valve consists of the valve body and a diaphragm. The valves close mechanically via a compressor, which is located above the diaphragm. These valves are well suited for on/off throttling control applications, involving slurries, powders, liquids, granulated materials and applications where scale build-up is a problem.

Product features

Size range:25mm – 350mm.
Valve type:Straight through
Elastomer diaphragm:Gum Rubber, Red Rubber, EPDM Butyl, Chlorobutyl, Neoprene, PtFE Polyurethane, Vitron & Hupalon.
Valve internals:304 Stainless steel spindles, rubber diaphragm
Temperature range:-50°C to + 140°C
Pressure rating:Up to 240 psi (16 bar)
Body material:Cast aluminium, cast SG iron
Body lining:As per Elastomer diaphragm
Flanged body:Drilled to SABS, ANSI, BS or DIN
Hydro-static test:1.5 Times the rated pressure

  • 100% drip tight closure even with solids in the medium.
  • 240 PSI (16 Bar)
  • All types of actuators can be fitted.
  • Fast easy diaphragm change.
  • Flexible re-inforced diaphragm.
  • Full bore, low friction loss.
  • Lifting lugs.
  • Lightweight.
  • Long operating life.
  • No glands which require adjustment.
  • Open/Closed indicator cover.
  • Replaceable rubber diaphragm and body lining.
  • Rising or Non-Rising spindle.
  • Seals in both directions.
  • Single wearing part.

How the valve operates

As the valve cycles downwards, the compressor will start to compress the soft rubber diaphragm, from the top of the valve only, therefore achieving 100% drip tight closure, even with solids in the medium.


The valve is suited for mining and mineral processing, power generation, sand/gravel, chemical & soda ash, pulp & paper, environmental & effluent, dry feeds and powders.



All types of actuators can be fitted; electric, gearbox, hydraulic, pneumatic and handwheel.

Dimensions and Weights

Dimensions and weights are for guidance only – detailed dimension drawings are available on request.
All dimensions are in millimetres, unless otherwise stated.

Nominal Bore (mm)ABCWeight (kg)
1Body/BonnetCast aluminium or SG iron
2DiaphragmRubber or urethane
3Valve Body LiningRubber, urethane, halar or ceramic
4Bolts and NutsCadmium plated steel
5PaintEpoxy powder coated, Rilsan lined or painted to custom spec
6Hand wheelCast SG iron
7Rev NutBrass

Valve Diaphragm

GradeMaterialColourShore HardnessTemp °C
NANatural rubberWhite65 – 75-30° to 80°
NiNitrile rubberYellow65 – 75-30° to 80°
BYButylBlue60 – 70-25° to 95°
NENeopreneRed60 – 70-25° to 120°
HYHypalonGreen60 – 70-15° to 100°
VVitonPink70 – 80-5° to 150°
PUPolyurethaneBlack80 – 90-5° to 80°