PED Valve Ports
PED Valve Ports
(OP)
I want to get PED for some valves (pressure accessories) but I am a little conjused over the port fittings. The valve uses SAE threads (3/4-16 UNF-2A) in accordance with ISO 725.
The problem is that the port fittings we use are rated by the manufacturer to 6000psi (412bar) and compliant with ANSI B1.1 and yet when I check the measurements of the fittings it also complies with ISO 11926-3 (Light duty stud ends) which are rated to a maximum of 4580psi (315bar). They do not comply with the ISO 11926-2 (Heavy-duty stud ends). The difference being the thread engagement.
I need to rate the valve to 5000psi (350bar). For PED can I accept the manufacturer's rating of 6000psi?
Fred
The problem is that the port fittings we use are rated by the manufacturer to 6000psi (412bar) and compliant with ANSI B1.1 and yet when I check the measurements of the fittings it also complies with ISO 11926-3 (Light duty stud ends) which are rated to a maximum of 4580psi (315bar). They do not comply with the ISO 11926-2 (Heavy-duty stud ends). The difference being the thread engagement.
I need to rate the valve to 5000psi (350bar). For PED can I accept the manufacturer's rating of 6000psi?
Fred





RE: PED Valve Ports
In general the fitting is the weakest part of the design, the weakest link drives the specification ratings.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada