Commercial Brass Products

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Commercial Brass Products
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Presents

• FLUSH LOGIC

The Working of a Flush Valve
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Flush valves in themselves are very reliable.
They have been used over the last 60 to 70 years
as the means for waste evacuation of commercial
fixtures. The following is a simple explanation
of the working of a flush valve.
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Flush Valves Require Two Important Factors For
Their Operation

• Adequate water line pressure. (minimum 15 psi)
• Adequate pipe size to maintain a volume of water
  to sustain the water line pressure.
• In professionally engineered commercial projects
  the plumbing engineer is responsible for these
  two factors.

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Typical Pipe SizingCommercial /
InstitutionalBuilding
Saint Frank Lastowski Hospital and Golfers Rehab
Center
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Whats in the Flush ValveThe Flush Valve
Diaphragm Kit and its components. The things
that make it all happen.
Trip Mechanism/Relief Valve P6000-EC13
Closet P6000-EU13 Urinal
Inside Plastic Cover P6000-L
Molded Disc P6000-E14
Diaphragm Orifice or By-pass Hole
Diaphragm Kit (Shown in Full Assembly)
Diaphragm
Guide Ring
Cylinder Guide
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Before The Valve is Activated
Flush valve at rest Before a flush, the water
pressure above and below the diaphragm are equal
due to the diaphragm orifice or by-pass hole
passage between them. The trip mechanism and
diaphragm are sealed and at rest. No water is
flushing.
Diaphragm Orifice or By-pass Hole
Diaphragm
Trip Mechanism
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Activation of the Valve
Molded Disc
Once the handle is pushed, the trip mechanism is
tipped and breaks its seal with the molded
disc. Water from the area above the diaphragm is
dumped into the outlet bore of the valve through
the cylinder guide. This lowers the pressure
above the diaphragm.
Trip Mechanism
Handle
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Action After Valve is Activated
The higher water pressure under the diaphragm
pushes the diaphragm kit upward off the outlet
bore of the valve. The outlet bore is now open
and the flush begins. After the trip mechanism
clears the actuator rod, it seats with the molded
disk and seals the top diaphragm area.
Molded Disc
Valve Outlet Bore
Trip Mechanism
Water Flow
Actuator Rod
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As the Valve Flushes
Water in the body and inlet rush down the open
outlet bore. The higher water pressure below the
diaphragm forces water through the orifice or
by-pass hole into the area above the diaphragm
and begins the process of building pressure above
the diaphragm.
Diaphragm Orifice or By-pass Hole
Inlet
Valve Outlet Bore
Body
Water Flow
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The Flush Terminating
As the pressure above the diaphragm builds, it
forces the diaphragm down back toward the outlet
bore. Water rushing down the outlet bore hits the
guide ring and also helps push the diaphragm kit
downward.
Diaphragm
Valve Outlet Bore
Guide Ring
As the diaphragm approaches the bore, a seal
starts to be made and the flush begins to
terminate. The flush valve shuts off quietly and
is ready for the next activation and returns back
to the rested position.
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Determine the Flush
The thickness and shape of the flow ring, the
orifice size, the length of the trip mechanism
and the guide ring determine the flush duration
and volume. Different Flows Water
Closets 4.5 GPF 3.5 GPF 1.6 GPF
Urinals 3.0 GPF 1.5 GPF 1.0 GPF
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AquaVantage and Aquaflush Kit Configurations

• The next three slides will show the kit
  configurations for the flows that are desired.
  Note the Color of the Trip Mechanism and Flow
  Ring that produces the proper GPF for each kit.

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Valve Trouble Shooting

• Valve not shutting off
• Cause - Debris lodged in the diaphragm orifice,
  debris under the trip mechanism, debris or
  buildup of chemicals from hard water on the
  molded disc.
• Fix - Clean or replace affected parts.
• Non Functional Handle - Handle will not activate
  valve and appears to be in flush position.
• Cause - Broken retainer or spring
• Fix - replace broken part and add Silicone grease
• Leaking around the valve cap at top of valve
• Cause - Cracked inner cover (P6000-L) or a loose
  outer cover
• Fix - Replace inner cover (P6000-L) or tighten
  outer cover to torque 25
• Leaking at the stop nut
• Cause - Bad Oring on tailpiece (P6000-C31)
• Fix - Replace the Oring (P6000-C31)
• Leaking at the Handle
• Cause - Bad handle seal, ripped or missing handle
  gasket or handle nut not tightened
• Fix - replace handle seal, replace or put on a
  handle gasket, tighten handle nut

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Valve Trouble Shooting cont

• Leaking at top of Vacuum Breaker Tube
• Cause - Bad vacuum breaker
• Fix - Replace with new vacuum breaker repair kit
  (P6000-B)
• Flush Valve will not flush
• Cause - Broken trip, trip mechanism lodged in up
  position, no water available
• Fix - Replace broken trip (P6000-EC13 (closet) or
  P6000-EU13 (urinal)), clean trip mechanism so
  that the lower part will flop up and down freely,
  make sure that the stop valve is in the on
  position or make sure that the main water supply
  is turned on
• Run-on Flush
• Cause - possible debris on the valve internals or
  the orifice may be plugged
• Fix - Clean the internal parts of the valve
  and/or make sure the orifice is clear
• Short flush
• Cause - Molded retainer is unscrewed, the flush
  kit is undersized for fixture being used, running
  pressure too low
• Fix - the molded retainer should be torqued to
  15, upgrade to a new kit to flush according to
  the fixture rate, re-size the water system

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Flush Valve Parts
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Zurn Flush Logic

• This presentation was compiled by the following
• Tim OConnor - Sanford Engineering
• Jody Randall - Supervisor Customer Service
• February 2004

Zurn Industries, Inc. Commercial Brass
Products 5900 Elwin Buchanan Drive Sanford, NC
27330 1-800-997-3876 Website www.zurn.com