ALMOST EVERY KNOWN FLUID IN INDUSTRY THROUGHT THE WORLD CAN BE, AND IS , HANDLED BY THE DIAPHRAGM VALVES. The basic construction of the Diaphragm valve is quite simple. It is composed of three principal units called Body, Bonnet and Diaphragm.
Diaphragm valves are particularly suitable for service lines handling Corrosive, Abrasives, Viscous or Fibrous Fluids.
ADVANTAGES OF DIAPHRAGM VALVES
The mo
st economical corrosion/abrasion resisting valve available today.
- Versatile Body and Diaphragm materials.
Permanent bubble tightness against slurry, fibre and gases.- Resilient closure.
No contamination.The most suitable for Nuclear & Food Service.
No Gland packing.
Simple in-line maintenance.
Easy dismantling and assembly possible without removing the body from pipeline.
CHOICE OF BODIES There are numerous combinations available for slecting the most siutable body material, body lining and diaphragm material for a specific service depends on several variables, economic considerations nature of fluid handled, its concentration and corrosiveness,temperature,pressure,velocity and continuity of flow.
Flanged Ends- Cast Iron, Carbon steel, Stainless Steel (CF8,CF8M) sizes: DN 15- DN 300.Flanged End Cast Iron Lined- Natural Rubber, White Natural Rubber, Neoprene, Hypalon,Black Butyl, White Butyl, BunaN,Ebonite.
Sizes:DN 15- DN 300. CHOICE OF DIAPHRAGMS:
Diaphragm life depends not only upon the nature of the fliud handled but also upon the temperature, pressure and frequency of operations.
Diaphragms can be moulded in wide variety of compounds, to give most satisfactory results, depending upon application.UNIMAC elastomer diaphragms are marked with materials identification, vlave size, month and year of manufacture.
SALIENT FEATURES
BODY:
weir design reduces diaphragm travel, increasing its life pocketless design for contamination free performance and smooth flow characteristics. BONNET:
Isolates working parts from hazardous atmosphere. DIAPHRAGM:
Strong and Resilient, giving positive shut-off, designed to assist flow and totally isolates working parts from fluids. STEM & STEM BUSHING:
Designed to reduce friction for low opeartional torque. THRUST BEARING:
Provied for sizes 80mm and above to reduce friction and torque. FINGER PLATE & COMPRESSOR:
Finger plates or finger cast into the bonnet in larger valves combine with the compressor, supports diaphragm at all stages of travel to increase diaphragm life.
HAND WHEEL:
Comfortable handgrip, eases rapid operation. CLOSURE CAP:
Stops the ingress of foreing particles and atmosphere.Additionally an 'O'Ring seal can be provided to increase security on hazardous products. MANUFACTURING STANDARD:
'UNIMAC' Vlaves are manufactured to the following standards as well as being in over all lengths to BS:5156.
Flanges
British BS 10 Table D, E and F
BS 4504 Table PN 10/16
BS1560 Class 150. Female screwed Ends
BS 21 Taper
BS 21 Parallel
American ANSI B 16.1 Class 125
ANSI B 16.5 Class 150 MAJOR CONSUMERS:
Basic Chemicals, End User Chemicals, Food and Beverage, Mining, Nuclear Power, Pharmaceuticals, Pulp & Paper, Sewage Treatment, Water Treatment, Pollution Control.
Part No
Part Name
Material
1
Body / Lining
Cl / As Reqd
2
Diaphragm c)
NEOPRENE / As Reqd.
3
Bonnet
Cl
4
Compressor
AL a) / Cl
5
Hand Wheel
Cl
6
Stem Bushing
S.G.IRON
7
Stem
EN8 / 410
8
Thrust Bearing b)
Steel
a) For sizes upto 50 b) For Sizes 80 and higher c) Diaphragm Hardness shore 'A' d) Lining hardness - shore 'D' f) Flange : OD, THK, Drilling. Only Dimension 'A' is certified and conforms to BS:5156 Other dimensions are only indicative
