Maintain a minimum operating gap of 10% between the system operating pressure and the safety valve’s nameplate set pressure. Since direct spring-operated safety valves may “Simmer” or “Warn” at 90% of the nameplate set pressure, and since the factory standard leak test performed at 80% of nameplate set pressure, better seat tightness performance can be expected with an operating gap of 20%.
This drain hole is required on some models by the ASME Boiler and Pressure Vessel Code. It is intended to prevent any condensate from accumulating in the body that may freeze or corrode internal valve parts and prevent the valve from opening.
The drain hole should be piped away to safely dispose of any discharge or condensate.
At this time Kingston Valves have not been certified with the “The National Association of Corrosion Engineers” (NACE International).
The Canadian Registration Number (CRN) for a boiler or pressure vessel is the tracking number used by the Canadian Provinces to track Canadian certified valve designs. The letter C following the designation is for a design registered in all Canadian jurisdictions.
Here at Kingston, we employ skilled and innovative engineers who specialize in custom valve design. If you have a design dilemma and would like a custom valve for your design needs, please contact our Help Desk so we may better assist you. You can reach our offices Monday through Friday from 6:30am to 5:00pm at (800) 997-0500.
See chart on the back of our line card or in our brochures.
- Size (inlet & outlet)
- Media (Air, Liquid, Gas, etc.)
- Flow requirements (scfm for air/gas, gpm for liquids, lbs/hr for steam service)
- Required Set Pressure
- Temperature considerations
- Materials of Construction considerations
ASME Section VIII is the section of the ASME Boiler & Pressure Vessel Code (BPVC) that covers pressure vessels. It specifically refers to the pressure vessels that operate at pressures, either internal or external, that exceed 15 psig. ASME Section I covers steam applications on fired vessels (boilers).
ASME stands for American Society of Mechanical Engineers. ASME is a not-for-profit membership organization that enables collaboration, knowledge sharing, career enrichment, and skills development across all engineering disciplines, toward a goal of helping the global engineering community develop solutions to benefit lives and livelihoods. Founded in 1880 by a small group of leading industrialists, ASME has grown through the decades to include more than 100,000 members in 140+ countries. Thirty-two thousand of these members are students.
The National Board of Boiler and Pressure Vessel Inspectors was created in 1919 to promote greater safety to life and property through uniformity in the construction, installation, repair, maintenance, and inspection of pressure equipment. The National Board membership oversees adherence to laws, rules, and regulations relating to boilers and pressure vessels.