Diaphragm seals are flexible membranes used to isolate and seal an enclosure. Due to the flexible nature of the seal, pressure effects can cross the barrier, but the material that is being contained cannot. Diaphragm seals are commonly used to keep the fluid whose pressure is being measured from affecting the pressure sensors.

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Haygor Diaphragm Seal Ordering Guide Update_Jan 2017

 

Download – Diaphragm Seal Ordering Guide

A direct connection or capillary is used to connect the measuring instrument to the diaphragm seal. Capillaries are helpful for remotely mounting instruments. Fortunately, to help you find the best diaphragm seals and capillaries for your applications, Haygor supplies a broad range of options from the top manufacturers in the world.

Why Use Diaphragm Seal Systems?

In short, diaphragm seal systems offer protection to guarantee reliability and safety. They protect gauges from contaminated, hot, corrosive, or viscous materials. To prevent gauge failure that can cause safety problems for personnel and operations, diaphragm seals offer an added layer of protection to make sure the media does not reach the gauge.

Diaphragm seals also extend the service life of the pressure instrument, which reduces process downtimes. They prevent corrosion, contamination, or clogging of your pressure gauges while eliminating or reducing maintenance costs. Plus, they reduce fugitive emissions.

What Are Diaphragm Seals Made of?

Diaphragms seals are available to handle a broad range of applications and fluids. Elastomers are commonly used, since diaphragm seals must be highly flexible. They also include a vast array of both specialty and general purpose rubbers. Low pressure applications generally benefit from the use of elastomers.

When specific chemical compatibility and high pressure ratings are required, metal diaphragms made of titanium, stainless steel, or various other metals are used. Flush welded versions and flanged assemblies are available.

When Are Diaphragm Seals Used?

Whenever a process fluid needs to be protected from a pressure sensor, or vice versa, a diaphragm seal will come in handy. For instance, in pharmaceutical and food sanitary processes where allowing process fluid to accumulate could compromise the purity of the fluid. Or, if the metal surface of the pressure sensor could contaminate a very pure process fluid, as in the petrochemical industry, diaphragm seals and capillaries should be utilized.

Different Types of Diaphragm Seals

Flush Flanged Seal

Flush Flanged Seal

  • Flanged Seal with flush diaphragm for Off-line process connection
  • Standard flange sizes from ANSI 2” to 4”. Additional sizes available on request
  • Standard flange ratings from ANSI Class 150 to ANSI Class 2500
  • Other flange standards available

Flanged Pancake Seal

Flanged Pancake Seal

  • Flanged Wafer/Pancake Seal with flush diaphragm for Off-line process connection
  • Standard flange sizes from ANSI 2” to 4”. Additional sizes available on request
  • Standard flange ratings from ANSI Class 150 to ANSI Class 2500
  • Sold with or without the flange
  • Other flange standards available

Flanged Extended Seal

Flanged Extended Seal

  • Flanged Seal with extended diaphragm for Off-line process connection
  • Enable flush installation on pipe or heavily insulated tanks.
  • Standard flange sizes from ANSI 2” to 4”. Additional sizes available on request
  • Standard flange ratings from ANSI Class 150 to ANSI Class 2500
  • Custom extension lengths and diameters are available
  • Other flange standards available

Flanged Offline Seal

Flanged Offline Seal

  • Flanged Seal with recessed diaphragm for Off-line process connection
  • 3 Sizes to fit various applications
  • Standard flange sizes from ANSI ½” to 3”.
  • Standard flange ratings from ANSI Class 150 to 600, Extended rating to ANSI class 1500
  • Other flange standards available

Threaded Offline Seal
Threaded Seal

  • Standard threaded Seal for off-line process connections.
  • 3 Sizes to fit various applications
  • Standard Pressure ratings to 1500 PSI and 2500 PSI, Higher pressure ratings available
  • Male or female NPT process connection

All Welded Threaded Mini Seal
All Welded Threaded Mini Seal

  • Small threaded seal for off-line process connections
  • All welded construction, No gasket, No Bolting
  • Male or female NPT process connection

Saddle Seal
Saddle Seal

  • Welded saddle flange seal for on-line pipe applications
  • Standard sizes for 3” pipe and 4” and larger pipe.
  • Standard pressure rating to 1500 PSI
  • Custom configurations available per application. Consult factory
  • Replacement for other manufacturers saddles. Consult factory

Flush Threaded Seal
Flush Threaded Seal

  • Male NPT threaded body with flush diaphragm at the end of threads.
  • Suitable for pressures up to 9000 PSI depending on size
  • Sizes from 3/4” NPT to 2” NPT

Chemical Tee / Wedge Seal
Chemical Tee - Wedge Seal

  • Chemical Tee or Wedge flanged seal to fit flow wedge applications
  • 300 PSI maximum working pressure
  • Body material always matches the diaphragm material

Pulp & Paper Seal
Pulp & Paper Seal

  • Pulp and paper industry standard seals for on-line applications.
  • Interchangeability with many other manufacturers designs
  • Other connection designs may available per application. Consult factory

Sanitary Seal
Sanitary Seal

  • Sanitary food, beverage and pharmaceutical seals
  • Tri-Clamp®, and Cherry Burrell I-line ® sanitary piping systems connections
  • Industry standard tank spud connections
  • Other connection types available on request. Consult factory

Calibration / Flushing Ring
Calibration - Flushing Ring

  • Calibration / Flushing Ring Intended for use with model HFF and HFP
  • Standard flange sizes from ANSI 2” to 4”. Additional sizes available on request
  • Pressure ratings to ANSI class 2500.
  • Other flange standards available

From our headquarters in the heart of the petrochemical industry in Houston, Texas, Haygor has over 50 years of combined experience providing diaphragm seals and capillaries for many major operations in a broad range of industries. Please contact us today if you need diaphragm seals and capillaries or any other type of industrial assistance.