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Types 66R and 66RR
D100248X012
Instruction Manual
Form 1737
November 2009

TYPE 66R RELIEF VALVE
W1935
TYPE 66RR RELIEF VALVE
W1908
Figure 1. Typical Constructions
*Relief valve dened in ANSI standard B95.1-1972. Not all codes or regulations permit these valves to be used as nal overpressure protection devices.


This manual describes and provides instructions, installation,
and parts list for Type 66R direct-operated relief valve* and
for Type 66RR pilot-operated relief valve* complete with
Type Y695RR pilot. Instructions and parts list for other
Fisher
®
equipment used with these relief valves are found in
separate manuals.

Types 66R and 66RR throttling relief valves (Figure 1) are
used to help protect a system against overpressure, or to
maintain an inlet or backpressure. The Type 66R direct-
operated construction is used for set pressure ranges of
2-inches w.c. to 5 psig (5 mbar to 0,34 bar), while the
Type 66RR pilot-operated construction with the Type Y695RR
pilot is used for set pressure ranges of 4-inches w.c. to 7 psig
(10 mbar to 0,48 bar).

Refer to Specications for Types 66R and 66RR
constructions listed on page 2. Some specications for a
given relief valve as it originally comes from the factory are
stamped on nameplates located on the Type 66R relief valve
body or Type 66RR main valve body.


Refer to Figure 2. Inlet pressure registers under the diaphragm
and is opposed by the spring. When the inlet pressure
increases above the spring setting, the valve plug opens in
a throttling manner and relieves the inlet pressure. As inlet
pressure drops back to set pressure, the spring closes the
valve plug.


Refer to Figure 2. Inlet pressure registers on the bottom
of the pilot diaphragm through the upstream control line
and bleeds through a xed restriction in the pilot to provide
loading pressure that helps the main valve spring keep
the main valve plug tightly shut off. When inlet pressure
exceeds the setting of the pilot spring, the pilot diaphragm
moves upward, opening the pilot valve disk and relieving
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Inhaltsverzeichnis

Seite 1 - Types 66R and 66RR

Types 66R and 66RRD100248X012Instruction ManualForm 1737November 2009TYPE 66R RELIEF VALVEW1935TYPE 66RR RELIEF VALVEW1908Figur

Seite 2

Types 66R and 66RR10Key 2, Spring Case AssemblyKey 6, Spring  

Seite 3

Types 66R and 66RR11*Recommended spare part.  34 Washer, Zinc-plated steel NPS 2 (DN 50) body (7 required for ca

Seite 4

Types 66R and 66RRThe Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owner

Seite 5

Types 66R and 66RR2

Seite 6

Types 66R and 66RR3           

Seite 7

Types 66R and 66RR4 8. Each unit is factory-set for the set pressure specied on the order. If no setting is specied, set pressure is fact

Seite 8

Types 66R and 66RR5!Relief valve parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of

Seite 9

Types 66R and 66RR6! 6. Install the diaphragm case gasket (key 35) and diaphragm case (key 3) on either the body ange or seali

Seite 10

Types 66R and 66RR7 1. Remove the closing cap (key 22), and turn the adjusting screw (key 35) counterclockwise

Seite 11

Types 66R and 66RR820719110118913413415322322153324391736406242526272329283018353723Figure 6. Ty

Seite 12

Types 66R and 66RR951A7562_EFigure 7. Type 66RR Main Valve and Pilot Mounting Parts*Recommended spare part.

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