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Bulletin 71.4:66

D100152X012

November 2009



TYPE 66R RELIEF VALVE

TYPE 66RR RELIEF VALVE

W1953

W1908



Figure 1. Typical Constructions



Types 66R and 66RR low-pressure throttling relief

valves

(1)

are used to help protect a system against

overpressure, or to maintain an inlet or backpressure.

The standard Type 66R direct-operated construction

is used for 2-inches w.c. to 2 psig (5 mbar to 0,14 bar)

set pressure ranges, while the standard Type 66RR

pilot-operated construction with Type Y695RR pilot is

used for 4-inches w.c. to 4.5 psig (10 mbar to 0,31 bar)

set pressure ranges. However, higher set pressure

ranges are available with optional springs, diaphragm

plates, and other internal parts.

Standard Type 66R relief valves have internal

registration through a stem guide (Figure 2) that

reduces the need for control line piping, while cast iron

body Type 66R relief valves additionally are available

with a sealing diaphragm and a tapped connection

boss on the diaphragm case for external registration

that requires a separate control line. All Type 66RR

relief valves come standard with internal registration in

the main valve body and tapped connection bosses on

the pilot casings for external registration that requires

a separate control line.



  

  —Retainer (Figure 2) in standard

valve plug assembly closes against seat ring

before assembly can overtravel and thus

overcompress O-ring.

  —Steel bodies are

available for increased resistance to piping

stresses or whenever dictated by local codes.

External registration is optional with all cast iron

bodies for wherever a remote control line is

required. These relief valves can be used for

vacuum service in both standard and special

versions, since vacuum service capacity is

comparable with relief service capacity.

  —Fluorocarbon (FKM)

soft parts and stainless steel metal trim parts are

available for high-temperatures and/or special

gases. Optional all-metal seats lessen O-ring seat

erosion problems with coke gas or other corrosive

applications and have knife-edged guides on their

valve plug skirts to help prevent particle

accumulation with dirty service.

1. Throttling 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.

1 2 3 4 5 6 ... 11 12

Bulletin 71.4:66 1

Indice de contenidos

Pagina 1 - Bulletin 71.4:66

Bulletin 71.4:66D100152X012November 2009TYPE 66R RELIEF VALVETYPE 66RR RELIEF VALVEW1953W1908

Pagina 2

Bulletin 71.4:6610When ordering, specify: 1. Composition and specic gravity of gas (including chemical analysis

Pagina 3

Bulletin 71.4:6611***Readily Available for Shipment**Allow Additional Time for Shipment*Special Order, Constructed from No

Pagina 4

Bulletin 71.4:66The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners.

Pagina 5

Bulletin 71.4:662TYPESNOMINAL BODY SIZE, NPS (DN)END CONNECTIONSTYLES AND RATINGS(1)

Pagina 6

Bulletin 71.4:663    NPT: 50 pounds (23 kg) for Type 66R or 65 pounds (29 kg) for

Pagina 7

Bulletin 71.4:664Table 1. Spring Selection for Type 66R Relief Set Pressure RangesBODY SIZE, NPS (DN)CONSTRuCTION RELIEF SET PRESSuRE RANGESPRING PAR

Pagina 8

Bulletin 71.4:665Table 3.IECSizingCoefcientsTable 4.SelectedType66RReliefCapacitiesinSCFH(Nm3/h)of0.6SpecicGravityNaturalGas(1)BO

Pagina 9

Bulletin 71.4:666Table 5.SelectedType66RRReliefCapacitiesinSCFH(Nm3/h)of0.6SpecicGravityNaturalGas(1)BODY SIZE, NPS (DN)TYPE PI

Pagina 10

Bulletin 71.4:667SEE “CAPACITY INFORMATION” SECTION FOR CONVERSION TO EquIVALENT CAPACITIES OF OThER GASES AND/OR CuBIC METERS PER hOuR. EACh Cu

Pagina 11

Bulletin 71.4:668BJ8921-CA2562CONTROL LINEDIGESTERTANkGAS TOFuEL SYSTEMCOMPRESSORFigure 5. Type 66R Relief Valve Installation at Outlet of Sewage Tre

Pagina 12

Bulletin 71.4:669INChES()AD6045-D21A9672-AB1410FDEGCAA/21/4 NPT VENT1/2 NPTCONTROL LINECONNECTIONPILOT ExhAuST