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Type N6
Installation
▲
WARNING
Personal injury or system damage may
result if this valve is installed, without
appropriate overpressure protection,
where service conditions could exceed
the limits given in the Specifications
section and/or valve nameplate.
Additionally, physical damage to the
valve may result in personal injury or
property damage due to escaping of
accumulated gas. To avoid such injury
and damage, install the valve in a
safe location.
Under enclosed conditions or indoors,
escaping gas may accumulate and be an
explosion hazard. In this case, the vent
should be piped outdoors.
For valve constructions with a spring
case vent, the vent should be kept
open to permit free flow of gas to the
atmosphere. Protect openings against
entrance of rain, snow, insects or any
other foreign material that may plug the
spring case vent or vent line.
All pressure equipment should be
installed in a non-seismic area;
should not be exposed to fire; and
should be protected from thunderbolt
(lightning) strikes.
△
After the valve is in service at operating
pressure and temperature, check all
gasketed joints and re-tighten. Failure to
follow these instructions may result in
damage to gaskets and mating surfaces.
• Carefully clear inlet piping system of foreign
matter such as: welding beads, scale, sand, pipe
compound, etc.
• Allow head room above the valve for maintenance.
4
CAUTION
• Provide a three-valve by-pass to facilitate
inspection of the regulator without
interrupting service.
• Preferred position for Type N6 valve is in a
horizontal line with spring chamber up and arrow on
body pointing in direction of flow.
• The loading line should be 1/4-in. pipe connected to
the spring chamber tap.
• Avoid damaging effects of foreign matter in the flow
by using Emerson strainer ahead of the valve.
Startup and Adjustment
1. Type N6 valves are shipped with the adjusting
spring precompressed. This precompression
may result in a differential pressure higher than
desired. Remove adjusting screw cover and
loosen adjusting screw locknut. It is recommended
that the precompression be removed by turning
the adjusting screw counter-clockwise until the
screw turns easily indicating the spring load has
been removed.
2. Open the inlet stop valve gradually until the
Type N6 differential valve takes control as
indicated by the differential pressure gauge.
3. Turn adjusting screw clockwise to increase the
differential pressure and counter-clockwise to
decrease it.
4. With no compression on the adjusting spring the
pump discharge pressure and the boiler pressure
applied to the spring chamber will be the same,
due to the fact that the piston and the disk have
the same area and are balanced. To increase
differential pressure, compress adjusting spring
until desired differential is obtained.
Maintenance
▲
WARNING
To avoid personal injury, property
damage or equipment damage caused by
sudden release of pressure or explosion
of accumulated gas, do not attempt any
maintenance or disassembly without first
isolating the valve from system pressure
and relieving all internal pressure from
the valve.
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