Calibration / Flushing Ring

A calibration / flushing ring is a separate flange accessory with one or two radial service ports. It is installed in the flange stack next to a compatible diaphragm seal so technicians can connect a controlled flushing, purging, venting, draining, or calibration-pressure line without removing the seal from the process connection.

No. The HFR is an accessory and does not contain the sensing diaphragm or instrument fill system. Haygor publishes it for use with the HFF Flush Flanged Seal and HFP Flanged Pancake Seal. The diaphragm seal performs the pressure isolation; the HFR provides service-port access at the process interface.

Haygor identifies the HFR for use with the HFF and HFP models. The published alignment tab is included for those Haygor assemblies. Any use with another manufacturer or another seal geometry requires dimensional, face-style, gasket, bore, bolting, and pressure-temperature review.

The published standard size codes are 20 for 2-inch ANSI, 30 for 3-inch ANSI, 40 for 4-inch ANSI, C0 for DN50, D0 for DN80, and E0 for DN100. Code XX is listed for another size as specified. Availability and dimensions should be confirmed in the current configurator and an approved drawing.

Raised Face code A is machined for a compatible raised-face flange joint and uses the published RF alignment-tab geometry when paired with HFF or HFP. Ring Joint code R includes the applicable RTJ groove geometry. The selected face style, gasket or ring number, mating flange, class, bolting, and joint stack-up must all match.

Yes. The ordering guide lists single- and dual-port arrangements. Dual ports can support a defined inlet-and-outlet flushing path or separate service connections when the piping and operating procedure are engineered for that purpose. Port orientation and valve or plug access should be established before fabrication.

Published choices are single or dual 1/4-inch NPT female, single or dual 1/2-inch NPT female, single or dual 1/4-inch pipe socket weld, and single or dual 1/2-inch pipe socket weld. Select the port style together with the service tubing, valves, plugs, pressure rating, corrosion allowance, and maintenance procedure.

Haygor lists 316/316L stainless steel, 304/304L stainless steel, Alloy 20, Alloy C-276, Alloy B-3, Monel 400, Alloy 600, Alloy 2205, Nickel 201/200, Titanium, Zirconium 702, and PTFE. Material selection must address the process fluid, flush or calibration medium, temperature, pressure, permeation, mechanical loading, and the complete flange joint.

The published Raised Face drawing shows an alignment tab used when the HFR is paired with Haygor HFF and HFP seals. Haygor lists option /NT to omit the tab for Raised Face use with non-Haygor seals. The catalog notes that, without the tab, the thickness dimension is reduced by the published E value. Confirm the current controlled drawing before setting bolt length or joint stack-up.

Haygor publishes HFR availability through ANSI Class 2500. A class designation is not a single universal pressure value. The allowable pressure-temperature rating of the completed assembly depends on nominal size, face style, material, flange standard, gasket or RTJ ring, bolting, ports, valves or plugs, the diaphragm seal, and applicable piping rules.

Provide the mating diaphragm seal model, flange standard, nominal size, class or PN rating, Raised Face or RTJ style, gasket or ring number, single or dual port requirement, NPTF or socket-weld port size, port orientation, body material, process and service fluids, operating and design pressure, temperatures, valve or plug requirements, bolting and stack-up constraints, documentation, and any use with a non-Haygor seal.