Unlined - WT

Unlined – WT

KDVs Weir Type Diaphragm Valves offer exceptional durability, reliability and control. The clean design completely isolates line media from the mechanical components of the valve.

Features & Benefits

  • Bubble-tight shutoff (Class VI)
  • Cavity free design
  • Easy/low maintenance
  • In-line serviceable (top entry)
  • No stem seal leakage
  • Standard Position indicator


  • Water and waste water
  • Organic sludge
  • Effluent treatment
  • Lime solutions
  • Gases (e.g. compressed air)
  • Lubricating oil
Nominal Size:  DN15-DN350
Face to Face: BS, DIN, MSS
Flange Drilling: ANSI#125/150, PN10/16, Table D/E, JIS
Pressure: Up to 16 Bar (Elastomer Diaphragm)*
Up to 10 Bar (PTFE Diaphragm)*
*Max pressure varies across size range

Material of Construction

Diaphragm Materials

10 – Natural rubber (NR)
20 – EPDM rubber
30 – Butyl rubber (IIR)
40 – Nitrile rubber (NBR)
50 – Neoprene rubber (CR)
60 – Hypalon rubber (CSM)
70 – Viton rubber (FKM/FPM)
92 – PTFE/EPDM backed
93 – PTFE/Butyl backed
96 – PTFE/Hypalon backed
97 – PTFE/Viton backed
98 – PTFE/Silicon backed
with titanium Connector)
NB: Vacuum grade diaphragms available on request

Design Standards

EN13397-2001 (BS5156:1985)
MSS SP88-1993-(R-01)

Testing Standards

EN12266-1 2002(BS6755 Part 1)
MSS SP88-1993-(R-01)


WT Range Brochure

1.92 MB

Actuation Brochure

1.45 MB

WT Diaphragms Brochure

561.62 KB

Data Sheet

MSS SP88-1993-(R-01)

DN25-DN150 Rising Handwheel

352.56 KB

DN25-DN150 Non Rising Handwheel

260.56 KB

DN200-DN300 Non Rising Handwheel

386.12 KB
EN558-1 Series 1(DIN3202-F1)

DN15-DN150 Rising Handwheel

353.11 KB

DN15-DN150 Non Rising Handwheel

260.54 KB

DN200-DN350 Non Rising Handwheel

386.41 KB
EN558-1 Series 7(BS5156)

DN15-DN150 Rising Handwheel

353.05 KB

DN15-DN150 Non Rising Handwheel

260.39 KB

DN200-DN350 Non Rising Handwheel

386.56 KB

Installation and Operation Manual

KDV Diaphragm Valve Service Instructions

955.41 KB