Meyer C Series, Manual, Page: 6 / 20

6
safety labels affixed to the equipment may be obscured when installed and integrated into a
customer’s particular application or process. If this is the case, contact the factory for additional labels.
The following recommendations are offered to assist in the placement of additional safety labels if
needed. The objective is for anyone who approaches the Double Flapgate to be able to see the labels
alerting him or her how to avoid the hazard.
• Place labels in locations that all personnel operating and maintaining the Double Flapgate Airlock
Valve or any other people that may have access to the equipment will readily see as they are
preparing to work on the equipment and/or as they approach it.
•
Due to the location of the Double Flapgate Airlock Valve, labels may have to be located near it, for
example: on nearby structural steel or adjacent equipment. This location needs to be the point of
access where the label can be easily seen and the hazard is clearly associated with the Double
Flapgate.
If you have received a unit without labels or if labels fall off or are damaged, contact Meyer
immediately (800-963-4458) to obtain replacements at no charge, prior to installation, use or
maintenance.
Please provide unit operating temperature at time of request.
11
A gravity-actuated valve gate will remain closed until the combination of process pressures and
process material weight exceeds the counter-force offered by the counterweight on a given valve. If
the pressure above the gate is greater than the pressure below, this force acts to keep the gate open
and conversely, if the pressure below is greater, this force acts to keep the gate closed. Once the
combination of material weight and the force of any pressure across the gate exceed the
counterweight force, the gate will open. Often, this same material load will drop from the upper to
lower gates, actuating the lower gate shortly after the upper gate releases the material, sometimes
allowing both gates to be open simultaneously and then closing once the material has been
discharged. The electromechanically operated valve can perform in a similar way, given sufficient air
pressures and material weights.
SECTION IV
INSTALLATION
When installing the equipment, verify that the openings will be properly guarded and that the labels
will be visible (See “HAZARD IDENTIFICATION” section). In addition, the installer must read and
understand the “IMPORTANT SAFETY INFORMATION” section before installing the equipment.
The internals of this equipment has part(s) that will crush and cut. Before installing
the equipment ensure that Lockout/Tagout procedures have been followed. Failure to do so will
lead to serious injury or death if a body part contacts a moving internal part.
BASIC DOUBLE FLAPGATE AIRLOCK VALVE MOUNTING
Normally, the Double Flapgate Airlock Valves are delivered fully assembled. F or shipping purposes,
they may be broken down due to the overall height of the unit. The single valves/Dutchman can be
assembled together and then installed, or installed piece by piece.
1. We recommend that inlet and outlet flanges remain covered until the valve is ready to
be attached to the mating equipment.
2. Prior to installing the valve and with the power disconnected, check to ensure no foreign
objects have been left inside or have accidentally fallen into the valve.
3. Identify the inlet of the Double Flapgate before beginning installation. This can be done by
either comparing the equipment with the images in the product description section or to any
available literature or drawings. The metal plate/gate is flat on top and the gate lever is
attached below.
4. The Double Flapgate Valves must be installed with the top and bottom flanges level and
parallel to the mating system flanges using the appropriate fasteners. The valves must be
adequately supported to prevent distortion.
5. Ensure that the inlet and outlet flanges are permanently fastened to mating components or
are permanently guarded.
6. Check and make sure that the mounting fasteners are tight and that the equipment is
adequately supported.
7. The pneumatically actuated units were tested and adjusted prior to shipment. The gravity
actuated counterweight units will require adjustment during startup.