Ashcroft 81 Specifications
Data Sheet
81 Bolt-thru Isolation Ring
FEATURES
360° Instrument rotation with SQR™ option
Selection of 1˝ through 10 ˝ nominal pipe size
Non-clogging/low maintenance
Complete instrument protection
Ensure reliable/accurate pressure readings
Optional retrofit end plates to replace competitive
units
TYPICAL USES
Water and Wastewater
Mining
SPECIFICATIONS
Sizes: 1˝ to 10˝
Process Connection
Size:
Pressure Rating
(MAWP):
Fill: Glycerin: 0°F to 400°F (0 to 204°C)
Instrument Removal: Direct-mount, Needle valve, Safe Quick Release
Added Tolerance: ±0.5% typical
Approvals: CRN
WETTED COMPONENTS
End Plate Material Flexible Liner
Carbon steel, 316L SS, PVDF
NON-WETTED COMPONENTS
MIN/MAX TEMPERATURE LIMITS
Liner Temperature Limits
Buna-N –30°F to 225°F (–34°C to 107°C)
Teflon –15°F to 350°F (–25°C to 177°C)
Viton –15°F to 350°F (–25°C to 177°C)
Natural Rubber –30°F to 225°F (–34°C to 107°C)
EPDM –40°F to 300°F (–40°C to 149°C)
¼ NPT Female, ½ NPT Female
Per customer flanges:
ASME B16.5 150 or 300 Class Pressures
Silicone (10Cst): –40°F to 500°F (–40 to 260°C)
Silicone (50Cst): –40°F to 600°F (–40 to 316°C)
Halocarbon®: –70°F to 300°F (–57 to 149°C)
(SQR™), Needle valve and SQR™ (02T conn.)
Buna, PTFE, EPDM,
Natural rubber, and Viton
®
Body
Carbon Steel, 316SS
360° ROTATION
SQR™ OPTION
SHOWN
81 Bolt-thru Isolation Ring
Nominal Size: 1˝ to 10˝
KEY BENEFITS
• Reliable when continuous pressure
measurements are needed
• Non-clogging and low maintenance
• Complete instrument protection
All specifications are subject to change without notice.
All sales subject to standard terms and conditions.
©2018 Ashcroft Inc. 81_bolt-thru_ring_ds3.0, Rev. D, 11/18
ashcroft.com
info@ashcroft.com
1.800.328.8258
of 31
Data Sheet
81 Bolt-thru Isolation Ring
ORDERING CODE Example:
Seal Type
81 - Bolt-thru isolation ring 81
Process Connection Size
02 - 2˝ (see table 2 on page 3) 02
Inner Flexible Wall
E - Buna-N E
T - PTFE (available in 2˝ to 10˝)
®
Y - Viton
R - Natural rubber
P - EPDM
End Plate Material
B - Carbon steel B
S - 316L SS
K - CPVC (available in 1˝)
F - PVDF
Body Material
B - Carbon steel B
S - 316L SS
Instrument Connection Size
02T - ¼ NPT Female 02T
04T - ½ NPT Female (ring body tapped with ¼ NPT connection; 04T connection utilizes ¼-½ NPT adapter)
Instrument Removal Option
N - Direct-mount N
V - Needle valve
Q - Safe Quick Release (SQR™)
Z - Needle valve and SQR (requires 02T instrument connection)
Pressure Class
150 - 150-class ASME
300 - 300-class ASME 300
Options (if choosing option(s) must include an “X”)
Fill Fluid
CG - Glycerin
CK - Silicone SF-96 CK
CF - Halocarbon
CT - 50/50 Ethylene Glycol/water
Multiple Instrument Assemblies (contact factory for additional arrangements or custom orientations.)
H3 - ¼ NPT gauge/ ¼ NPT Male transducer/ 02T isolation ring H3
H5 - ½ NPT gauge/ ½ NPT Male switch/ 04T isolation ring
H6 - ½ NPT gauge/2 ½ NPT Male switches/ 02T isolation ring
H7 - ¼ NPT gauge/ ¼ NPT Female switch/ 02T isolation ring
Optional Features
IR - Retrofit end plates (custom end plates widths for drop-in replacements)
NH - SS tag wired to ring NH
Q8 - Elbow for vertical pipe installation (02T connection only)
®
81 02 E B B 02T N 300 XCK H3 NH
X__
Consult factory for multiple instrument assemblies, welded assembly options, additional process connection sizes and fill fluids
All specifications are subject to change without notice.
All sales subject to standard terms and conditions.
©2018 Ashcroft Inc. 81_bolt-thru_ring_ds3.0, Rev. D, 11/18
ashcroft.com
info@ashcroft.com
1.800.328.8258
of 32
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