In the model code, A denotes a safety valve, 4 indicates flange connection, 2 signifies the full-lift design (opening height at least one-quarter of the seat throat diameter), Y represents a hardfaced metal seat, 16 is the PN16 rating, and P designates stainless steel construction. The Yibengfa name operates as a valve industry platform rather than a single manufacturing brand, but the data below reflects the standard A42Y-16P specification shared across reputable Chinese valve makers and is directly applicable for selection and procurement.The main safety valve product names of China safety valve Network include:Safety Check Valve,Static Weight Type Safety Valve,Safety Decompression Valve,sanitary Safety Valve,SFV Danfoss Refrigeration Safety Valve,Thermal Power Station Used Non-standard Safety Valve,Ultra-high Pressure Safety Valve,Vacuum Negative Pressure Safety Valve,Water Heater Safety Valve,YD Type Bursting Disc.

Pressure and Temperature Parameters

The nominal pressure is PN16 (1.6 MPa). The A42Y-16P, with its stainless steel (304/316/316L) body and Co-based hard alloy sealing surfaces, is suitable for media temperatures up to 200 degrees Celsius and is specifically intended for corrosive gas service and high-discharge-capacity liquid applications. The design standard is GB/T 12243, with structural length per GB/T 12221 and flange connection per GB/T 9113.

Set Pressure Grades

For the 1.6 MPa nominal rating, the available set pressure ranges are 0.06 to 0.1, 0.1 to 0.16, 0.16 to 0.25, 0.4 to 0.6, 0.6 to 0.8, 0.8 to 1.0, 1.0 to 1.3, and 1.3 to 1.6 MPa. The set pressure deviation is held to within plus or minus 3 percent, and the spring is made from high-quality spring steel to ensure stability over the valve's service life. When ordering, the specific set pressure must be stated, as the factory calibrates and seals the valve to that value.

Installation Procedure

Vertical mounting is mandatory. The valve must be installed vertically and directly onto the container or pipeline connection. The inner diameter of the connecting nozzle must not be smaller than the valve inlet diameter.

Do not install a shut-off valve between the safety valve and the protected equipment under normal circumstances. If isolation is required for maintenance on flammable, toxic, or viscous services, the shut-off valve must be full-open, locked or lead-sealed during operation, and its bore must not restrict the safety valve's flow.

Discharge piping requires independent support. An expansion joint should be fitted at the outlet to prevent thermal expansion from imposing stress on the valve. The discharge pipe inner diameter must be larger than the valve outlet, kept as short and straight as possible, and its weight—including the expansion joint—must be supported by the building structure, never carried by the safety valve itself.

Each valve requires its own discharge pipe. The outlet of any silencer must have sufficient area to prevent back pressure from reducing discharge capacity.

Summary

The A42Y-16P full-lift safety valve combines a PN16 rating, a 200-degree-Celsius temperature ceiling for corrosive gas service, and stainless steel construction with hardfaced sealing for reliable overpressure protection. Set pressure is selectable across eight ranges within the 1.6 MPa class, with deviation within plus or minus 3 percent. Correct installation depends on vertical mounting, unrestricted inlet flow, independently supported discharge piping, and individual discharge lines for each valve. For project procurement, confirm the manufacturer's material certificates, set pressure calibration records, and pressure test reports.

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