Data Sheet

Bulletin 71.2:627F
2
Body Sizes and End Connection Styles
Ductile iron: 3/4, 1, or 2 NPT
Steel: 3/4, 1, or 2 NPT;
NPS 1 or 2 / DN 25 or 50, CL150 RF,
CL300 RF, CL600 RF, PN 16/25/40 RF
Maximum Inlet and Differential Pressures
(1)
See Table 2
Minimum Pressure Differential
20 psid / 1.4 bar d
Outlet Pressure Ranges
(1)
5 to 100 psig / 0.34 to 6.9 bar
See Table 1
Maximum Emergency Outlet Pressure
(1)
250 psig / 17.2 bar for all Type 627F actuators
and Type 6351F pilot components.
Outlet Pressure Accuracy
±1% of absolute pressure setting
(1)
(psia or bar
absolute) when inlet pressure is held within
allowable variations shown in Table 3; droop does
 notexceed1%ofabsolutepressuresettingfor 
 owratesshowninTables6through8.
Flow Coefcients
See Table 4
IEC Sizing Coefcients
See Table 5
Typical Regulating Capacities
 SeeTables6through8andCapacity
Information section
Typical Performance Curve
See Figure 3
Construction Materials
Type 627F Main Regulator
Body: Ductile iron (standard) or steel
Spring Case and Diaphragm Case: Die cast
Aluminum (standard), Ductile iron, or Steel
 Orice:Aluminum (standard) or Stainless steel
1.Thepressure/temperaturelimitsinthisBulletinandanyapplicablestandardorcodelimitationshouldnotbeexceeded.
Specications
Construction Materials (continued)
Disk Assembly: Aluminum (standard) or
Stainless steel holder with Nitrile (NBR) disk
O-Rings and Diaphragm: Nitrile (NBR)
Tension Spring: Plated steel
Type 6351F Pilot
Body: Stainless steel
Spring Case: Aluminum
Diaphragm: Nylon fabric coated with Nitrile (NBR)
Inner Valve Plug: Stainless steel/Nitrile (NBR) or
Stainless steel/Fluorocarbon (FKM)
Stem: Stainless steel
Control Spring: Zinc-plated steel
Valve Spring: Stainless steel
Pusher Post: Aluminum or Stainless steel
Diaphragm Plate, Lower Spring Guide, and
Adjusting Screw: Zinc-plated steel
Temperature Capabilities
(1)
 -20to180°F/-29to82°C
Pressure Registration
 Externalthrough1/4NPT(internal)control 
line connection (see Figure 2)
Pilot Spring Case Vent Connection
1/4 NPT (internal) with removable screened
vent assembly
Pilot Connections
1/4 NPT (internal)
Approximate Weights
NPT body with Ductile Iron or Steel Casings:
10 pounds / 4.5 kg
NPT body with Aluminum Casings:
6.3 pounds / 2.9 kg
Flanged body with Steel Casings:
 18pounds/8.2kg
Flanged body with Ductile Iron Casings:
14 pounds / 6.4 kg
External Dimensions
See Figure 4