At High Precision Gas, we value our customers and strive to consistently meet and exceed their expectations. With that said, we utilize CGA 555 valves in our LPG cylinders for liquid-to-liquid service to ensure Compressed Gas Association (CGA) and National Fire Protection Association (NFPA) compliance, safety, and ease of use.
CGA 555 Valve Features include:
- Excess flow (ball) check valve limits flow in case of line breaks or accidental disconnects
- Fixed level vent valve
- Full-length liquid withdrawal tube
- Pressure relief valve
Why CGA 555 (and not CGA 510) when used in liquid-to-liquid butane/propane service?
- CGA specifies to use the CGA 555 in a liquid application.
- NFPA 58 Liquified Petroleum Gas Code requires CGA 555 outlet and internal excess-flow valve for use in liquid service for capacity less than or equal to 420 lb. propane capacity.
- The CGA 510 is the same fitting used in other gas applications (e.g., barbeque grills, gas stoves, outdoor gas heater), and therefore a CGA 510 with a liquid withdrawal tube attached can be easily mistaken and connected to a vapor gas application. This can lead to a very dangerous scenario.
- Well known valve OEMs (i.e., Rotarex, Rego, Sherwood, Marshall Excelsior) do not (and will not) sell a CGA 510 with a liquid withdrawal tube. Any CGA 510 with a liquid withdrawal tube is modified without the express consent of the valve OEM, and most have been discovered to not have an internal excess-flow provision installed.