Meyer C Series, Manual, Page: 7 / 20

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For pneumatic operation, the HPSC and HPTC use shaft-mounted rotary actuators while the LPTF has
the external end of the shaft keyed and clamped to a cylinder lever arm of a pneumatic cylinder.
For electro-mechanical operation, cam followers are mounted on the external end of the shafts. A
motor drives a gear reducer which has a cam mounted on its output shaft. This cam rotates and
sequentially actuates each cam follower, thereby opening and closing each gate. A counterweight
mounted on the opposite end of the shaft keeps the cam followers riding on the cam.
The gravity actuated valve relies on the combination of the weight of the material and system
pressure to open and counterweights to close.
HPSC & HPTC have rows of packing ring seals provided in the packing areas built into each side of the
housing. Packing gland nuts may be periodically tightened to compress the packing material, thereby
providing a seal between shaft and the housing. In some cases, air purge may be provided in this seal
area; one row of packing is removed and a lantern ring is installed in its place. Compressed air is then
introduced externally through a connection in the housing into the lantern ring.
LPTF utilize the flange mounted bearing seal to provide sealing around the shaft since these are for low
pressure differential applications.
BASIC OPERATIONAL CYCLE
A pneumatic Double Flapgate Valve has four repeating stages in its normal operating cycle, as
follows (refer to Figure below):
Stage I.
Stage II.
Stage III.
Stage IV.
At the start, top and bottom gates are both closed.
Top gate opens allowing the material to move inside the empty chamber between the
gates. The bottom gate remains in the closed position.
Top gate closes.
After the pre-determined cycle time, the bottom gate opens and allows the material
to discharge.
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SECTION II
RECEIVING AND STORAGE
A. Receiving
Upon receipt of equipment and material from Meyer, the following basic steps should be taken. The
equipment is heavy and proper handling procedures should be used (See the “ Heavy - handle safely ”
information in the “IMPORTANT SAFETY INFORMATION” section).
1.
Use the packing list to determine that all the items shipped have been received. Your equipment
was carefully crated for safe shipment when given to the carrier. If items are missing, contact
Meyer, per the contact information at the end of this section.
2.
Check for damage. Damage in transit is the responsibility of the carrier. Title to your equipment
and all other items in the shipment were transferred to you as soon as the shipment left our
dock, thus it is your responsibility to handle any claim. In the event damage has occurred:
a.
Be sure to have the driver sign a copy of the freight bill with a notation about any
damage and contact their office before the driver leaves your premises.
b.
Contact the carrier to arrange for an independent inspector to come out to inspect the
damage and to prepare the inspection report. It is imperative that this inspection is done
before you start to unpack or use any of the equipment.
c.
If there are any visible problems with your unit or any other items in the shipment, you or the
driver must note in detail the damage on all copies of the freight bill before signing for the
shipment. Then immediately call Meyer.
d.
Photographic records of the damage are helpful to communicate the extent and type
of damage as well as provide a clear record.
e.
In addition to inspecting damaged equipment, you should also check the condition of the
safety labels to ensure they have not been damaged or come off. If they have, contact the
Factory for replacements prior to installation.
f.
Concealed Damage: If Equipment or goods are discovered to be damaged in shipment at a
later date, contact the carrier and Meyer immediately.
g.
In all cases of damage in transit, contact Meyer for assistance in determining whether or not
this damage may, in any way, affect safety or proper operation. Please contact us so that
we can assist you with replacement parts or with any questions about the claim process,
using the following contact information:
Wm. W. Meyer & Sons, Inc.
1700 Franklin Blvd
Libertyville, IL 60048
800-963-4458 or 847-918-0111
sales@wmwmeyer.com