On-Off VALVES
Benefits
Economical with an attractive price and low maintenance.
Erosion and corrosion resistant.
Low pressure recovery (high FL factor).
Lightweight and mechanical strength.
Excellent regulation performance.
Applications
Industries:
- Chlor-Alkali Plants
- Water treatment plants
- Paper pulp mill
- Battery materials plant
Typical fluids:
- Brine
- Wet chlorine
- Hydrochloric acid
- Caustic soda
- Sodium carbonate
- Sodium hypochlorite
- Ferric chloride
- Zinc sulfate
- Copper chloride
- Sodium chlorate
- Sulfuric acid
- Chlorine dioxide
- Sodium sulfite
- Bromine
- Lime water
- Aqua regia
- Copper sulfate
- And more!
FEATURES AND BENEFITS
Our valves offer:
• 100% positive shut-off
• Stem sealed TA-Luft VDI 2440 and ISO 15848-1
• 1/4 turn operation
• Full bore
• Reduced operating torque
• Special design for slurry
Why Polymer material?
The corrosion resistance of metals is generally determined in still fluids. But at high flow speeds and in the presence of turbulence, a process known as “erosion induced corrosion” starts destroying even the so-called “corrosion resistant” metals. In such situation, solid polymers offer an economic solution that will outperform even “special metals” and other exotic materials.
Taber Abraser
Apart from polyamid, which cannot be used because of its low chemical resistance, the best abrasion resistant material is PVDF. This material should be preferred for all parts of the valve making up the “Vena contracta”. When PVDF cannot be used for chemical reason, such as in concentrated hydroxides, then PPH and ECTFE are acceptable alternatives.
It is readily seen that PTFE, which has the lowest abrasion resistance of all polymers, is the worst choice for contact with the flow in the Vena Contracta. However, because of its almost universal chemical resistance, PTFE is often found as a liner in control valves, either globe valves or diaphragm valves. Such valves suffer a fast deterioration of the flow throttling parts, such as discs, seats, diaphragms etc.
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Materials
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Weight loss mg/10000 rev.
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|---|---|
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PVDF homopolymer SOLEF®
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5 - 10
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PVDF SOLEF® 21505/31508
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5 - 8
|
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PA 6 polyamid
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5
|
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ECTFE Halar ®
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13
|
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PP homopolymer
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15 - 20
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PTFE
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500 - 1000
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304 stainless steel
|
50
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Ball features
Standard
PPGF, DN80(3″) – DN150(6″)
PPH, DN15(1/2″) – DN50(2″)
Standard
PVDF, DN15(1/2″) – DN150(6″)
Type O
Ball with pressure relief hole
Type C
Ball with cut out, prevents pressure bulid-up, and allow a communication between the dead zones and flowing fluid when the valve is open, this is to reduce the deposits as less as possible in the dead zones.
Actuator
Non-metallic components are preferred for corrosive environments. Hence, Techlink valves come with corrosion resistant accessories. Techlink engineers have experienced the best results with the Max-air (Italy) Rack and pinion actuator
It has light weight, no extra support needed
All Techlink designs can be adjusted to customer specifications.
