Technical Specification
Description
The ARB-1 fits directly onto the WC pan
connector. The SRVB fits directly into the 4" waste pipe.
The use of one of our barriers reduces the likelihood of rodents
being attracted to the area of the WC pan and connector since the
black flap will significantly reduce the luminance which is known to
attract rodents. It also forms a physical obstruction to
rodents in the branch discharge pipe under no-flow conditions,
prevents cross-flow in horizontally-opposed connections and reduces
backflow.
The anti-rodent barrier is closed under static conditions and opens when there is flow through the valve, e.g. when the connected WC is flushed. /p>
When there is back pressure downstream of the anti-rodent barrier, the pressure closes the flap of the anti-rodent barrier, reducing backflow. When the flap of the anti-rodent barrier is closed, it does not create an airtight or watertight seal across the discharge pipe, but it does form a physical obstruction.
The anti-rodent barrier is moulded from black polypropylene. The thermoplastic elastomer (TPE) rubber seal is overmoulded onto the body and the anti-rodent barrier is attached with a pin and spring.
Manufacture
The lid and main body of the anti-rodent barriers are produced by injection moulding.
Quality control checks include visual checks and dimensional checks.
Storage
Anti-rodent barriers should not be allowed to come into contact with mineral oil, grease, putty or any compound containing these materials, and should be protected from direct sunlight and naked flames.
The anti-rodent barriers are not toys and should not be left within reach of children and or domestic pets.
Practicability of Installation
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Installation is easily achieved under normal conditions. The anti-rodent barriers may be fitted to a discharge pipe laid to minimal fall or in a vertical orientation. Installation instructions: http://www.ehow.com/how_5168869_keep-rats-snakes-out-toilet.html |
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The inclusion of an anti-rodent barrier in the sanitary pipework does not affect the flushing performance of the connected WC.
Air and Watertightness
The integral seal of the anti-rodent barrier provides an air and watertight seal between the WC pan connector outlet spigot and the discharge pipe and will remain so under conditions of deflection and thermal displacement in excess of those likely to occur in practice.
Resistance to Chemicals
The effluent and cleaners normal to WC systems will not affect the materials used for the anti-rodent barrier.
Maintenance
The anti-rodent barrier can be taken out after removal of the WC pan, without damage to the WC discharge pipe, to enable pipe blockages to be cleared or the pipe to be renewed.
Durability
There will be no significant deterioration of the product under normal service conditions. The anti-rodent barrier performed satisfactorily after being subjected to in excess of two million opening and closing cycles. In the opinion of the Government body which tested the barrier, the connectors will have a life in excess of 30 years.
Installation
General
Installation must be in accordance with the manufacturer's fitting instructions.
Ehow.com installation instructions: http://www.ehow.com/how_5168869_keep-rats-snakes-out-toilet.html
The anti-rodent barrier may be fitted to a discharge pipe laid to minimal fall or in a vertical orientation.
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The anti-rodent barrier may be used to permit branch discharge pipes to connect to the discharge stack at the same level, via a double 87.5° entry fitting. |
Typical connection via a double 87.5°
entry fitting |
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The anti-rodent barrier may be used to connect horizontally-opposed discharge pipes, into another discharge pipe, prior to discharging into the stack. |
Typical connection of horizontally-opposed discharge pipe |
Procedure
The WC pan connector must be reasonably clean and smooth on the outer surface. The TPE seal of the anti-rodent barrier is pushed fully home onto the pan connector.
The discharge pipe must be reasonably clean and smooth on the inner surface. The soil pipe is pushed fully home over the TPE seal of the anti-rodent barrier.
Technical Investigations
The following is a summary of the technical investigations carried out on the anti-rodent barrier.
Tests
Tests were carried out to determine:
- ease of installation
- air and watertightness when correctly installed
- effect of misalignment on leakage
- air and watertightness after maximum compression set, likely to occur in use, had been induced in the connector seal
- flow properties of the pipe, with the valve installed
- resistance to blockage
- effect on pan clearance
- resistance to cross-flow of horizontally-opposed branches
- resistance to backflow
- performance after being subjected to over two million operations
- resistance to water jetting equipment
Investigations
Data relating to the following were examined:
- material properties
- dimensional accuracy
- chemical resistance
- practicability of installation
- durability
