Marsh Bellofram - Marsh Division - Diaphragm Seals

Product catalog summary

Overview: This document provides technical specifications and features of various diaphragm seals designed for use with pressure gauges and instruments. These seals are crucial for isolating instruments from process media, thereby extending their service life by protecting them from corrosion, clogging, freezing, or pulsation.

Model 12000 Mini Serviceable Diaphragm Seal: Designed for gauges with operating pressures of 2500 psi (stainless) and 500 psi (PVC). It features an optional 'Easy Clean Out' for removing the process side housing without losing fill fluid. Available diaphragm materials include Nitrile, Fluorocarbon, and Neoprene. Fill options are Glycerine, Silicone, and Syltherm.

Model B8498 Gauge Protector: Suitable for high volume displacement with operating pressures up to 200 psi. It features a 1/4" threaded connection and chrome-plated zinc construction.

Model 13000 Mini Welded Diaphragm Seal: Designed for 2" to 3 1/2" bourdon tube gauges with a minimum pressure of 100 psi and a maximum of 2000 psi at 100º F. Available in 316 SS or Hastelloy C.

Model 13040 All Welded Diaphragm Seal: Suitable for pressure ranges from vacuum to 1000 psi, available in 316SS or Hastelloy C with optional flushing connections.

Model 14000 Removable Diaphragm Seal: Features a clamped metal design for pressures from vacuum to 2500 psi. It allows for field servicing with a fill/bleed port screw standard.

Model 14040 Welded Diaphragm Seal: Similar to Model 14000 but with a welded diaphragm-to-upper design, allowing removal of the upper housing without losing fill.

Key Specifications: Diaphragm materials include 316SS, Hastelloy C, and Tantalum. Fill options are Glycerine, Silicone, and Syltherm, with temperature ratings ranging from -40 to 750ºF depending on the fill type.

Catalog excerpts

Marsh Bellofram - Marsh Division - Diaphragm Seals-1

50 Diaphragm Seals MODEL 12000 MINI SERVICEABLE RUBBER DIAPHRAGM SEAL The Model 12000 Serviceable Mini Diaphragm Seal is designed for gauges and instruments with operating pressures of 2500 psi with stainless and 500 psi with PVC models. Ideally suited for small applications and corrosive installations. The optional ‘Easy Clean Out’ feature allows the removal of the process side housing without losing the instrument side fill fluid. Fill / bleed screw port in the instrument side housing, and stainless steel build screws are standard. FILLED & CALIBRATED TO GAUGES ONLY. ASSEMBLY 14" 22 DIAPHRAGM Nitrile 3 Fluorocarbon 4 Neoprene 5 FILL No Fill 0 Glycerine G Silicone S Syltherm Y B8498 12000 Diaphragm seals are isolation devices which separate pressure gauges and other instruments from the process media while allowing the instrument to measure the process pressure. The service life of the instrument is greatly extended, because it is protected from corrosion, clogging, freezing, or pulsation. LIQUID FILLINGS The selection of the fill depends on the temperature expected in any given application. Temperature ratings for available fillings are listed below. Glycerine 0 to 400ºF Silicone –40 to 600ºF Syltherm –40 to 750ºF DIAPHRAGM Nitrile 3 Fluorocarbon 4 Neoprene 5 EASY CLEAN OUT None 0 Clean Out 2 LOWER 316SS 14" 22 12" 24 PVC 14" 52 12" 54 FILL No Fill 0 Glycerine G Silicone S Syltherm Y UPPER 316SS 14" 22 12" 24 PVC 14" 52 12" 54 MODEL B8498 GAUGE PROTECTOR WITH RUBBER DIAPHRAGM SEAL The Model B8498 Gauge Protector 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 14" threaded connections and chrome plated zinc construction. A 38" flush plug is standard in the process side housing. FILLED & CALIBRATED TO GAUGES ONLY.

Open the catalog to page 1

Marsh Bellofram - Marsh Division - Diaphragm Seals-2

51 Diaphragm Seals 1.5" HEX 25/8" 1.53" 1.5" 2.5" HEX 1.66" 2.5" INST CONN INST CONN 25/8" 31/2" 31/2" PROCESS CONN PROCESS CONN 1.5" HEX 25/8" 1.53" 1.5" 2.5" HEX 1.66" 2.5" INST CONN UPPER 316SS 14" 22 12" 24 13040 MODEL 13000 MINI / ALL WELDED DIAPHRAGM SEAL The Model 13000 Mini Welded Seal is designed for 2" to 312" bourdon tube gauges with a minimum pressure of 100 psi. The maximum operating pressure is 2000 psi at 100º F. Available in all 316 SS or Hastelloy C process housing and diaphragm. FILLED & CALIBRATED TO GAUGES ONLY. MODEL 13040 ALL WELDED DIAPHRAGM SEAL The Model 13040 All Welded...

Open the catalog to page 2

Marsh Bellofram - Marsh Division - Diaphragm Seals-3

52 Diaphragm Seals MODEL 14000 REMOVABLE DIAPHRAGM SEAL The Model 14000 Diaphragm Seal is a clamped metal design featuring interlocking construction inside the bolt circle for perfect alignment. The upper and lower housings clamp the diaphragm in place and allow for field servicing. The 14000 is available in threaded connections for pressures from vacuum to 2500 psi. Fill/bleed port screw in the upper is standard and an optional flush connection is available. FILLED & CALIBRATED TO GAUGES ONLY. MODEL 14040 WELDED DIAPHRAGM SEAL The Model 14040 Welded Diaphragm Seal is a welded diaphragm-to-upper...

Open the catalog to page 3