Helpful Guidelines for Pulse Diaphragm Valve Operation

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Helpful Guidelines for Pulse Diaphragm Valve
Operation

• Presnted By- Abhinav Shashtri

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Index Index Index
SR.No Title Slide No
1 Introduction 3
2 1. Measure the Operation Time to Faulted Condition 4
3 2. Working Time is Important 5
4 3. Product Design 7
5 4. Know the B10 value 8
6 5. Monitoring 9
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Introduction-

• In industrial environments, pneumatic lines can
  pose significant hazards to workers and
  associated equipment both the lines themselves
  and the moving components they operate.
• We are going with the most important dust
  collector part called Pulse Diaphragm Valve. It
  is responsible for the continuous flow of air and
  collects dust in a bag filter. Its unique
  springless design provides fast opening and
  closing of the Pulse Valve with the saving of
  compressed air. Long life, High flow, and fast
  diaphragm operation produce reliable and
  economical operation.
• Systems have been developed to help minimize
  these hazards and to comply with two ISO safety
  standards (EN ISO 13849 and ISO 131182000),
  which mandate the dissipation of pneumatic energy
  to prevent unintended start-up or movement in a
  machine. Design engineers can utilize a pneumatic
  safety, such as Pulse Diaphragm Valve into an air
  preparation system to comply with these standards
  and increase levels of plant safety.
• Maniks pulse diaphragm valves are operated by
  integral solenoid pilot operator. When the valve
  is energized, the trapped air above the pulse
  valve diaphragm is quickly exhausted causing the
  fast opening of main diaphragm valve. When the
  pilot-operated valve is de-energized, air escapes
  through the bleed hole of main pulse valve to
  balance the diaphragm pressure and instantly
  closes the valve.
• Several important points should be considered
  when specifying a pulse diaphragm valve

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1. Measure the Operation Time to Faulted
Condition

• Take the time to understand the worst-case
  scenario as when safety of pulse diaphragm valve
  is in faulted condition, standard exhaust times
  (assuming normal stop) do not apply.
• In this situation there is a failure in the valve
  or control system and the exhaust flow may be
  restricted, thereby increasing exhaust time.

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2. Working Time is Important

• The faster a machine can stop, the closer to the
  machine that the guards, light curtains or other
  presence-sensing devices can be installed.
• The Working off impacts your calculations for
  safe stopping distance and your switching time on
  impacts the lag time to fill the machine.
• http//www.maniks.com/manufacturer/dust-collector-
  parts-manufacturer/

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3. Product Design

• Adopting a safety of pulse diaphragm valve with a
  series-parallel flow design means benefiting from
  the best of both series and parallel
  arrangements, ensuring that both valve elements
  (redundant design) must shift to supply air
  downstream. If particular valve element has to be
  out of position with the other, then the
  downstream air will be dumped to exhaust in
  parallel.
• This arrangement allows for higher exhaust flow
  capability and ensures very low residual pressure
  during a fault, eliminating the danger of
  residual energy making its way into the machine.
  Consequently, if two pulse diaphragm valves are
  used in series, the air supply to the first valve
  flows through to the second and then downstream.
  When in exhaust mode, this design flows most of
  the exhaust through the second valve creating a
  lag in exhaust time.

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4. Know the B10 value

• The valves B10 value is its life expectancy in
  switching cycles and is based on B10 testing (the
  point at which 10 of a sample has failed). Its
  an important consideration when determining the
  MTTFd.
• The higher the quality of the components is, the
  longer the B10 life of the machine into which
  they are built will be. This is an important
  consideration for Category 4 applications where a
  high diagnostic coverage is needed.
•  

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5. Monitoring

• To achieve the highest level of diagnostic
  coverage, its critical to employ all the best
  aspects of safety circuit architecture -
  redundancy (dual-channel circuits) and monitoring
  to detect faults or failures in control systems
  and check for short circuit faults. The measuring
  portion of the safety system must check to see if
  both sides of the valve are shifting together
  every time. This is generally done with most
  versions of safety relays and safety PLCs that
  can also perform pulse test monitoring.
• These types of safety relays and safety PLCs make
  for very reliable systems with high diagnostic
  coverage especially short circuit faults in
  dual channel systems. The use of sophisticated
  controls and monitoring ensuring the valve is
  functional.
• Safety allows no room for error. If the risk
  assessment requires a safety rating of PLc or
  higher for the pneumatic system, then a dual
  redundant safety exhaust valve offers a
  simple-to-implement and cost-effective way to
  attain the required safety level.
• http//www.maniks.com
•  

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