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The relief valve should be installed where it is easily accessible for maintenance. Care
should be taken that the relief valve CANNOT be isolated from the system when the
system is operational. A relief valve should never have a shutoff valve or a plug
downstream of its outlet. The PRV MUST be piped to an adequate drain. Operation will
discharge antifreeze or water from its outlet.
See Section 19.0 System Parts List for listing of part numbers and pressures available.
11.0 ANVIL COUPLINGS, SEALS & LUBE
11.1 Couplings
The C-4 rigid coupling is design for rigid piping applications. The C-4 is specially
designed to provide a rigid, locked-in pipe connection to meet the specific
demands of rigid design steel pipe.
Housing: Ductile iron conforming to ASTM A-536, Grade 65-45-12
ANSI Bolts and Heavy Hex Nuts: Heat treated, oval neck track head bolts
confirming to ASTM A-183 Grade 2with a minimum tensile strength of 110,000
psi and heavy hex nuts of carbon steel conforming to ASTMA-563 Grade A or
Grade B, or J995 Grade 2. Bolts and nuts are provided zinc electroplated as
standard.
Metric Bolts and Heavy Hex Nuts: Heat treated, zinc electroplated oval-neck
track head bolts made of carbon steel with mechanical properties per ISO 898-1
Class 8.8 Hex nuts and bolts are zinc electroplated followed by a yellow
chromate dip.
Gaskets: Grade “E” EPDM. NSF-61 Certified. -30 °F to 230 °F (Service
Temperature Range) (40 °C to 110°C) Recommended for water service, diluted
acids, alkalys solutions, oil-free air and many chemical services. Xtreme™
Lubricant is required for freezer applications.
11.2 Flush Gap Gaskets
Flush gap gaskets are designed to prohibit contamination from building up in the
gasket cavity. The centering rib fits flush over the gap between the two pipe ends
thus closing off the gasket cavity. Not recommended for temperatures above 160
°F.
11.3 Lubricant
GRUVLOK Xtreme Lubricant has been developed for use with Gruvlok couplings
in services where improved lubrication is beneficial. This lubricant has an
operating temperature range from -65 °F to 400°F, well exceeding the
temperature range of Gruvlok gaskets. This lubricant is waterproof, thereby
eliminating water wash-out and it will not dry out in the absence of water. There
are five primary applications where the Xtreme Lubricant will provide increased
benefits: low temperature applications (below -20 °F), high temperature
applications (above 180 °F), applications where increased pipe joint flexibility is
needed, lubrication of gaskets in copper systems, and for the lubrication of
gaskets on HDPE couplings. Since it is formulated from a non-hydro carbon
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