TRI LOK®
Installation, Operation and Maintenance Manual
© 2020 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
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3.5 Temperature Considerations
The surface temperature of the Tri Lok valve is wholly dependent on
the ambient temperature in combination with the temperature of the
process medium. The maximum surface temperature of the Tri Lok
valve may be calculated from the maximum ambient temperature plus
the maximum process medium temperature as shown below:
Equation 1 - Surface Temperature Calculation
Ts(max) = Ta(max) + Tp(max)
The system designer is responsible for ensuring the maximum
temperature, either inside the valve body or on the external surface,
will remain well below the ignition temperature of the atmosphere.
Additional protective devices may be required to ensure a sufficient
thermal safety margin, including but not limited to: thermal shut-off
devices and cooling devices.
For operating temperatures above 200° C (392°F) Bray recommends
thermal insulation of the valve body.
3.6 Static Electricity Considerations
Where the process medium is a liquid or semi-solid material with a
surface resistance in excess of 1 G-ohms, special precautions should be
taken to ensure the process does not generate electro-static discharge.
This may be done through ensuring the flow rate of the process media
remains below 1m/s or providing sufficient discharge points along the
process path to eliminate electrostatic build-up. Consultation to EN
50404 is recommended.
Appropriate grounding may be necessary through the use of grounding
straps or other means.
3.7 Stray Electric Current Considerations
When the Tri Lok valve is used near sources of high current or magnetic
radiation, a secure bonding to earth ground should be made so as to
prevent ignition due to inductive currents or a rise in temperature due
to these currents.
3.8 Filtration of Process Medium Considerations
Special consideration should be made regarding the filtration of
the process medium if there is a potential for the process medium
to contain solid particulates. The process medium is recommended
to be filtered to allow particles no greater than 1.0 mm in diameter
through the valve assembly where there is a high probability of solid
particulates. Larger particulate sizes may be deemed appropriate based
on the possibility of particulates within the process medium and the
area classification. The decision regarding filtration levels and limits
should be well-documented by the system designer and/or end user to
ensure continued compliance through the life of the valve.
