Ashcroft threaded diaphragm seals

Ashcroft threaded diaphragm seals

The Ashcroft 100 and 101 threaded diaphragm seals or isolation devices protect pressure measuring instruments. Used when process compatibility is required, these are also applied when media exhibits high temperature or the potential to clog an instrument connection. Ideal for satisfying many challenging applications.

What is a diaphragm seal?

The process side of the seal is isolated by a flexible diaphragm. The internal space between this diaphragm and the pressure measuring instrument is completely filled with a system fill fluid. The pressure is transmitted from the measured medium by the elastic diaphragm into the fluid and from there to the measuring element, i.e. to the pressure measuring instrument or the transmitter. In many cases, between the diaphragm seal and pressure measuring instrument, a capillary is connected in order (for example) to eliminate or to minimize temperature effects from the hot fluid to the measuring instrument. The capillary affects the response time of the overall system. Diaphragm seal, capillary and measuring instrument form a closed system. The sealed filling screws on the diaphragm seal and the measuring instrument must therefore never be opened since the function of the system is affected following any escape of filling liquid! The diaphragm and the connecting flange are the elements of the system which come into contact with the medium. Therefore, the material from which they are made must meet the relevant requirements in terms of temperature and corrosion resistance.

Features

• 316L stainless steel top housing (standard)
• Wide selection of diaphragm and lower housing materials
• Diaphragm threaded to top housing
• Flushing port (type 101) provides easy cleaning/flushing due to process media prone to clogging

Specifications Ashcroft threaded diaphragm seals

Style:

• Type 100: threaded
• Type 101: threaded with flushing port

Process size:

• NPT female: 1/4 to 1 1/2
• NPT male: 1/4 to 1

Rated up to 2,500 psi, optional 5,000 psi

Process Market:

• Oil and Gas
• Refineries
• Chemical and Petrochemical
• Water and Wastewater
• Process Applications:
• Oil and Gas Fracking
• NACE Compliant Processes (Sour Gas Separation)
• Biogas and Biodiesel

Data Sheet