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PTFE EXPANSION JOINTS

Molded flexible couplings and expansion joints of PTFE designed to help protect pumps, compressors and other expensive equipment.

PTFE Expansion Joint

Bellows-type flexible couplings and expansion joints are contour molded of black PTFE by a patented process. They are corrosion resistant, non-aging, with extraordinary flex life and unmatched reliability. These superior units cost no more than those made of lesser materials. The flexible element is formed over the full sealing face of the end flanges eliminating troublesome separate gaskets.



R6904 Flexible Coupling

R6904 PTFE
Flexible Coupling

Part No.Nominal
Size (I.D.)
A†BCMaximum
Misalignment*
Weight
(Lbs.)
Neutral
Length
Maximum
Travel ±
R6904-0161"1-3/8"1/4"2"1-7/8"1/8"2
R6904-0241-1/2"1-3/8"1/4"2-7/8"2-27/64"1/8"3
R6904-0322"1-9/16"1/4"3-5/8"3"1/8"7
R6904-0402-1/2"2-1/4"5/16"4-1/8"3-1/2"1/8"10
R6904-0483"2-1/4"3/8"5"4-1/4"3/16"12
R6904-0644"2-5/8"1/2"6-3/16"5-1/2"1/4"18
R6904-0805"3-1/4"1/2"7-5/16"6-1/2"1/4"24
R6904-0966"2-3/4"1/2"8-1/2"8"1/4"29
R6904-1288"4"1/2"10-5/8"10-5/64"1/4"47
R6904-16010"5-1/4"1/2"12-3/4"11-3/4"1/4"64
R6904-CR19212"6"1/2"15"15"1/4"115
This is an installation dimension; not a limit bolt setting.
* At neutral length with limit bolts in place.
Note: Angular Deflection approx. 7 degrees.
Maximum (axial) travel is based on installation with no misalignment or angular deflection.
12" size supplied only with crest rings in stainless steel.

Non-Shock Working Pressure Vs. Temperature R6904 Coupling
R6904 PTFE Flexible Coupling -
Pressure Vs Temperature Graph
Vacuum Data: See Below



R6905 Expansion Joint

R6905 PTFE
Expansion Joint

Part No.Nominal
Size (I.D.)
A†BCMaximum
Misalignment*
Weight
(Lbs.)
Neutral
Length
Maximum
Travel ±
R6905-0161"1-3/4"1/2"2"1-57/64"1/4"2
R6905-0241-1/2"2"1/2"2-7/8"2-35/64"1/4"4
R6905-0322"2-3/4"3/4"3-5/8"3-13/32"3/8"8
R6905-0402-1/2"3-3/16"3/4"4-1/8"3-13/16"3/8"11
R6905-0483"3-5/8"1"5"4-41/64"1/2"13
R6905-0644"3-5/8"1"6-3/16"5-11/16"1/2"19
R6905-0805"4"1"7-5/16"6-5/8"1/2"25
R6905-0966"4"1-1/8"8-1/2"8"9/16"30
R6905-1288"6"1-1/8"10-5/8"10-5/16"9/16"48
This is an installation dimension; not a limit bolt setting.
* At neutral length with limit bolts in place.
Note: Angular Deflection approx. 14 degrees.
Maximum (axial) travel is based on installation with no misalignment or angular deflection.

Non-Shock Working Pressure Vs. Temperature R6905 Joint
R6905 PTFE Expansion Joint -
Pressure Vs Temperature Graph
Vacuum Data: See Below



Vacuum Data
SizeR6904R6905
1-3"425ºF400ºF
4"400ºF400ºF
5-6"400ºF300ºF
8"250ºF125ºF
10"250ºF-
12"75ºF-
Note: These ratings are for flexible couplings or expansion joints in the fully extended condition. When they are at the neutral length or compressed, it is sometimes possible to exceed the listed temperature at full vacuum; consult the Tampa Rubber Customer Service Department



R6906 Bellows

R6906 PTFE
Bellows

Part No.Nominal
Size (I.D.)
A†BCMaximum
Misalignment*
Weight
(Lbs.)
Neutral
Length
Maximum
Travel ±
R6906-0161"3"1/2"2"1-57/64"1/2"2
R6906-0241-1/2"3-1/2"3/4"2-7/8"2-35/64"1/2"5
R6906-0322"4"1"3-5/8"3-13/32"1/2"9
R6906-0483"5"1"5"4-41/64"1/2"14
R6906-0644"5-1/4"1-1/4"6-3/16"5-11/16"5/8"20
R6906-0966"6"1-1/4"8-1/2"8"5/8"31
This is an installation dimension; not a limit bolt setting.
* At neutral length with limit bolts in place.
Note: Angular Deflection approx. 20 degrees.
Maximum (axial) travel is based on installation with no misalignment or angular deflection.

Non-Shock Working Pressure Vs. Temperature R6906 Bellows
R6906 PTFE Bellows -
Pressure Vs Temperature Graph
R6906 Bellows not recommended for vacuum service.
Recommended only for low pressure applications.



Safeguarding

The Chemical Plant and Petroleum Refinery Pressure Piping Code, ANSI / ASME B31.3, in Appendix G outlines recommendations for safeguarding piping systems. We subscribe to this emphasis on safety and endorse the code suggestion for shielding bellows units where hazardous fluids are conveyed. See below for information on wrap-around safety shields.

Limit Bolts

Limit bolts with elastic stop nuts are factory set at the maximum travel position to prevent over-extension. Severe damage or personal injury can result if the limit bolts and stop nuts are removed to exceed the factory setting, of it non-locking nuts are installed.



Ductile Iron Flange for R6904, R6905 & R6906

Flanges for
R6904, R6905 & R6906
Size
Code
Nom.
Size
DEFGHFlange
Thickness
J
HolesThreadB.C.*HolesThreadB.C.*B.C.
-0161"41/2-133-1/8"45/16-183-1/8"1/4"5-1/8"4-1/4"5/16"6"
-0241-1/2"41/2-133-7/8"45/16-183-7/8"1/4"5-7/8"5"11/32"6-3/4"
-0322"45/8-114-3/4"45/16-184-3/4"3/8"6-7/8"6"7/16"8-1/8"
-0402-1/2"45/8-115-1/2"---3/8"8-1/8"7"1/2"9-3/8"
-0483"45/8-116"45/16-186"3/4"8-3/4"7-1/2"1/2"10"
-0644"85/8-117-1/2"85/16-187-1/2"3/8"9-7/8"9"5/8"11-1/8"
-0805"83/4-108-1/2"---1/2"11-1/2"10"3/4"13"
-0966"83/4-109-1/2"83/8-169-1/2"1/2"12-1/2"11"3/4"14"
-1288"83/4-1011-3/4"---1/2"14-3/4"13-1/2"15/16"16-1/4"
-16010"127/8-914-1/4"---1/2"17-1/2"16"1"19"
-19212"127/8-917"---5/8"20-1/2"19"1"22"
* D & E Bolt circle same as 125 & 150 Lb. ANSI standard.



Internal Sleeve for
Expansion Joints

Use of Internal Sleeves in Expansion Joints

Certain abrasive applications, such as slurries, or high velocity flow rates may damage the inside surfaces of the bellows convolutes or the radius surface at the end flares. In such circumstances a nozzle liner may be factory installed in the up-stream side (inlet) of the bellows to help protect the unit or smooth out the flow. While such liners may greatly extend useful service life of the bellows, they will restrict movement unless all deflection is confined to straight axial compression and / or extension. Unless otherwise specified, overall length is 6 inches. Available for use with bellows units through 8 inches size.



Bellows Installation Instructions

  • Do not bore out threads in bolt holes.
  • Do not exceed pressure / temperature rating shown in appropriate bellows chart.
  • Safeguard units in hazardous service (See below).
  • Follow sound installation procedures. A typical reference is the "Piping Handbook" by Crocker & King published by McGraw-Hill.
  • Leave limit bolts in "as received" factory settings. Severe damage can result if the limit bolts and stop nuts are removed, replaced or altered to exceed the factory setting (See above).
  • Remove flange covers only when ready to install bellows.
  • Insure that sealing faces are clean, smooth & parallel.
  • For hot service install nearly extended; for cold service install nearly compressed.
  • Thread installation bolt from mating flange side to prevent possible damage to the TFE element. Do not extend bolts behind bellows flange more than 1-2 threads. Nut not necessary.
  • Additional information & specific bolt torque data will be found on the detailed installation instruction sheet included in the box of each & every unit shipped.
WARNING: Failure to follow the above installation instructions may cause premature failure and / or rupture of the unit resulting in property damage, serious personal injury or death.



Wrap-Around Safety Shields

Designed to Prevent Sprayout of Hazardous Fluids

Wrap-Around
Safety Shields
The Ramco® Expando-Gard Safety Shield provides practical and economical protection from the potential hazards created in the event of a leak of almost all hazardous fluids from piping expansion joints. It is designed to prevent sprayout of such fluids into adjacent areas and to protect personnel from possible serious injury and equipment from damage.
 
The Ramco® Expando-Gard Safety Shield is a wrap-around shield which tightens over the expansion joint. It remains tight when properly fitted without inhibiting the design movements of the expansion joint.
We are pleased to offer these as an optional accessory and recommend their use whenever hazardous fluids are conveyed.
Easy Two-Step Installation
 
1. Position shield so that bellows and pipe flanges are approximately centered within shield. Identification label is on the outside. Verify that bellows part number on shield matches bellows to be shielded.
 
2. Wrap-around and mate Velcro segments. Tighten drawstring at each end and knot securely (must be secured with a square knot, any other knot may be unsafe). Put leak indicator patch in plastic pocket. Insure that pocket is easily visible on installation.
Ramco is a registered trademark of Ramco Mfg. Co.

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Tampa Rubber & Gasket Co., Inc.

215 North 20th Street
Tampa, FL, USA 33605
Ph-813-247-3647 Fax-813-247-3180
Toll Free-800-940-4673 E-Mail - The Post Office
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