Data Sheet

Bulletin 71.2:92S

Figure 6. NPS 2-1/2, 3, and 4 / DN 65, 80, and 100 Piping Schematics

TYPE 92S MAIN VALVE

TYPE 6492H PILOT

BOTTOM VIEW

Noise level values for a regulator equipped either

with or without a noise attenuation trim are presented

in Table 6. These noise levels are determined at

a point 39-inches / 991 mm downstream of the

regulator outlet and 39-inches / 991 mm from the

piping surface.

For example, consider full-capacity ow of steam

through a NPS 2 / DN 50 Type 92S steam regulator

connected with uninsulated 2-inch / 51 mm Schedule

40 downstream piping (see Table 6). For an inlet

pressure of 250 psig / 17.2 bar and an outlet pressure

of 100 psig / 6.9 bar, P/P

1abs

is 0.6. Under the

specied service conditions, the noise level for steam

ow through a Type 92S steam regulator without a

noise attenuation trim will be 98 decibels, while the

same regulator equipped with a noise attenuation trim

will have a noise level reduced to 92 decibels.

Noise levels for steam ow through a Type 92S steam

regulator can be reduced further with the use of either

a heavier schedule of pipe or thermal insulation of

the downstream piping. By using thermal insulation,

as much as 15 decibels of noise can be additionally

reduced from the system. Consult the insulation

manufacturer’s specications for the attenuating

capability and application procedures of the specic

insulation required by your system.

TYPE 92S MAIN VALVE

SIDE VIEW

TYPE 6492HM SAFETY

OVERRIDE PILOT

TYPE 6492H PILOT