Electric-Operated Pinch Valve

Electric-Operated Pinch Valve

Pinch valves are ideal valves for fluids containing solid particles or contaminants to isolate and regulate pipelines. Because the sleeve is the only part in touch with the medium, it is extremely resistant to wear and corrosion. Even if complicated chemical processes are occurring in the pipeline, the pinch valve is still easy to handle them. Its applications include power plants, sewage treatment plants, mining, and chemical process control.

Additional information

Description

vf pinch valves2

Specifications

  • Body Material: Cast Iron, Cast Steel, Aluminium
  • Size: DN25 to DN1000
  • Nominal Pressure: PN16
  • Valve Type: Straight Through
  • Max. Working Pressure: 2.5MPa
  • Max. Shutoff Differential Pressure: 0.25MPa
  • Full Travel Loading Time(Open to Close): ≤3S
  • Effective Diameter: 25 to 1000mm
  • Leakage Class: IV. (Refer to standard API598)
  • Connection Type: Flange

Sleeve Materials For Pinch Valves

Sleeve Material Suitable Temperature Typical Medium Application
SBRT
Styrene Butadiene,
Flowrox Blend
‘-40°C  to +110°C Abrasive materials, diluted acid, alkali and chemical applications Heavy wearing
High cycle frequency
EPDM
Ethylene Propylene
40°C to +120°C Concentrated and oxidizing chemicals Chemical applications
– Applicable to 75% of all
industrial chemical applications
NBR
Nitrile Rubber
-30°C to +100°C Oils, fats, fuels, hydrocarbon, lubricants Applications involving oils, fats
and hydrocarbon
NR
Natural Rubber
‘-50°C to +75°C Abrasive materials, diluted acids, alkali a chemicals High wear applications
HNBR
Hydrogenated
Nitrile
-30°C to +160°C Oils, fats, fuels hydrocarbon, lubricants High temperature applications
NRF
Natural Rubber
Foodstuff Quality
White inner lining
-40°C to +75°C Media used in food and other CIP (clean-in-place) processes, alcohol Foodstuff applications
-Fulfils FDA Food and Drug Administration) requirements
NBRF
Nitrile Rubber
White inner lining
-30°C to +100°C Vegetable and animal oils and fats Applications involving fatty foodstuff
-Fulfls FDA (Food and Drug Administration) requirements
EPDM/B
Ethylene Propylene, Blend
-40°C to +100°C Green liquor, alkaline and extraneous matter in green
liquor processes
Pulp and paper industry’s
green liquor application
CR
Chloroprene Rubber
-40°C  to +100°C Chemicals, acids, several solvents, aliphatic oils, fats,
lubricants
Special-purpose chemical applications
-Resilient to ozone and averse
weather
 FPM
Fluorine Rubber
(Viton⑧)
-20°C to +120°C Chemicals, aliphatic oils, aromatic and halogenated hydrocarbon Special-purpose chemical applications
-Resilient to ozone and averse weather
CSM
Chloro-sulphone-ethylene([email protected])
-40°C to +100°C Chemicals, acids, several solvents, aliphatic oils, fats, lubricants Special-purpose chemical applications
-Resilient to ozone and averse weather
IIR
Butyl
-40°C to +100°C Concentrated and acidic chemicals, vegetable oils Special-purpose chemical applications
-Impermeable to gas
PU
Polyurethane with
PU lining
-10°C to +80°C Abrasive materials, diluted chemicals, hydrocarbon, oils, lubricants Abrasive media applications

 

Parts of Manual Pinch Valves

components of manual pinch valve

No Part Name No Part Name No Part Name
1 Protective Cover 8 Sleeve 15 Bolt
2 Retaining Ring 9 Lower Body 16 Upper Pinch Bar
3 Handwheel 10 Nut 17 Side Guide
4 Stem 11 Gasket 18 Block
5 Stem Nut 12 Bracket 19 Lower Pinch Bar
6 Centre Bushing 13 Thrust Bearing 20 Nut
7 Upper Body 14 Upper Guide Bushing 21 Lower Guide Bushing

 

What are the Primary Factors Influencing Pinch Valve Quality?

Pinch valve is consist of four components: valve body, sleeve, opening and closing mechanism, and driving device.

The sleeve is the key to the quality of the pinch valve, and the major variables influencing its quality are raw materials, rubber synthesis formula, processing technology, sleeve thickness, and wear-resistant anti-corrosion layer uniformity.

sleeve of pinch valve

 

The following are the 5 reasons for pinch valve quality issues.

  1. Insufficient natural raw rubber content and excessive regenerated rubber, which cause rubber loss, significant wear & tear, and short service life.
  2. Incorrect rubber composition causes poor wear resistance, and acid & alkali resistance.
  3. The sleeve manufacturing method impacts the quality of the valve; the molded rubber sleeve wear layer is prone to uneven thickness, resulting in thin areas that are easily broken. To provide a wear-resistant layer, a pure handmade rubber sleeve is used, and the thickness of the sandwich layer is consistent. The useful life has significantly enhanced.
  4. Rust on the valve body, and damage to the opening and closing mechanisms, cause the valve to shut too tightly or not completely close, resulting in unsatisfactory valve usage.
  5. Power sources such as pneumatic and electric actuators. THINKTANK is an independent research and development manufacturer of pneumatic actuators to satisfy the torque of pinch valves with a CE certificate.

sleeves for pinch valves1

vf pinch valves 1

 

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