Diaphragm Seals


Diaphragm seals are isolation devices, designed to separate pressure gauges and other instruments from the process media while allowing the instrument to accurately measure pressure. Marsh Bellofram recommends the use of diaphragm seals to extend instrumentation service life and reduce downtime and maintenance costs, by protecting instrumentation from corrosion, clogging, freezing, or pulsation damage.


B8498 Gauge Protector with Rubber Diaphragm Seal

B8498 Gauge Protector with Rubber Diaphragm Seal

The Model B8498 Gauge Protector with Rubber Diaphragm Seal from Marsh Instruments is designed for extremely high volume displacement. Ideally suited for gauges and instruments with operating pressures up to 200 psi and vacuum applications. Available in 1⁄4″ threaded connections […]

Model 12000 Mini Serviceable Rubber Diaphragm Seal

Model 12000 Mini Serviceable Rubber Diaphragm Seal

The Model 12000 Mini Serviceable Rubber Diaphragm Seal from Marsh Instruments is designed for use with gauges and instruments operating at pressures of 2500 psi with stainless steel models and 500 psi with PVC models. Marsh Bellofram recommends the use […]

Model 13000 Miniature All Welded Diaphragm Seal

Model 13000 Miniature All Welded Diaphragm Seal

The Marsh Instruments Model 13000 Miniature All Welded Diaphragm Seal is designed for use with 2” to 3.5” bourdon tube gauges with a minimum pressure of 100 psi. Seals are available in all 316 stainless steel or with Hastelloy™ C […]

Model 13040 All-Welded Diaphragm Seal

Model 13040 All-Welded Diaphragm Seal

The Marsh Bellofram Model 13040 All-Welded Diaphragm Seal is designed for use with 2” to 4.5” bourdon tube gauges with pressure ranges from vacuum to 1000 psi. Seals are available in all 316 stainless steel or with Hastelloy™ C process […]

Model 14000 Removable Diaphragm Seal

Model 14000 Removable Diaphragm Seal

The Marsh Instruments Model 14000 Removable Diaphragm Seal features a clamped metal design with interlocking construction inside of the bolt circle for perfect alignment. The upper and lower housings clamp the diaphragm in place and allow for ease of field […]

Model 14040 Welded Diaphragm Seal

Model 14040 Welded Diaphragm Seal

About the Model 14040 Welded Diaphragm Seal. The Marsh Bellofram Model 14040 Welded Diaphragm Seal offers a special diaphragm-to-upper design that allows the upper housing to be removed with the instrument still in place, without losing liquid fill. The same […]