Frequently Asked Questions
Can I auto-weld your Pure-Flo valves without tube extensions?
Is ITT able to supply the diaphragm valves with a CE-Mark?
What is the difference between a TM diaphragm and a Grade 17 diaphragm?
Why did we offer change to the TM diaphragm as an option?
What is the difference between 316 stainless steel casting, forging and wrought material?
The FDA does not approve valves. FDA lists acceptable materials in 21 CFR 177. Pure-Flo diaphragm valves comply with this standard. Top
Can I auto-weld your Pure-Flo valves without tube extensions?
ITT provides a minimum 0.5" long cutback for auto-weld however an offset weld head may be required. Check with your auto-weld supplier. Top
Is ITT able to supply the diaphragm valves with a CE-Mark?
We can supply certain valves in accordance with the EC Pressure Equipment Directive 97/23/EC (PED). In many cases, the CE mark is not required, and at times, not permitted. For more information, please ask for our white paper on Pure-Flo products. Regarding other products, the PED is being implemented. Top
6D refers to a branch pipe connection which has a length of 6 times the diameter of the branch. The length is measured from the axis of the run. Top
Bioprocessing Equipment Design and Manufacturing Standards published in 1997, by the American Society of Mechanical Engineers. Top
Simply stated, electropolishing is the electrochemical method of removing metal. Formally, electropolishing is defined as anodic dissolution. Top
Surface finish refers to the surface roughness and/or surface preparation and is normally quantified in micro inches or microns. Refer to ANSI B46.1 for more information. Top
What is the difference between a TM diaphragm and a Grade 17 diaphragm?
The "TM" PTFE diaphragm provides greater dimensional stability, longer flex life, lower porosity, lower permeability, superior thermo-mechanical performance and is tougher and more durable. The "Grade 17" EPDM is comprised of higher molecular weight terpolymer elastomer, which provides increased mechanical properties while reducing compression set. In addition, the diaphragm is peroxide cured rather than sulfur cured enhancing the biocompatibility of the material. For additional features and benefits of "TM" and "Grade 17" diaphragms see the Diaphragm Brochure. Top
Why did we offer change to the TM diaphragm as an option?
The TM diaphragm is made of the second generation PTFE polymer modified with PPVE co-monomer. The resulting product has increase performance and longer life versus traditional PTFE diaphragms. The TM diaphragm meets 21 CFR 177.55 and is classified as homopolymer according to ISO 12086. Top
What is the difference between 316 stainless steel casting, forging and wrought material?
The different ASTM standards apply to each method of manufacturing. As standard practice, we control the amount of ferrite content in material namely: 12%, 0.5% and <3%; for casting, forging and wrought, respectively. Top
