ZBA46Y/F-16/25/40/64/100/160 C/P/R Pilot-Operated Relief Valve

Pilot-Operated Relief Valve for pressure vessels and pipelines needing high seat tightness, high back pressure capability, online set pressure verification and adjustable blowdown. Key selection data include DN and outlet size per catalog main connection dimension table, PN16, PN25, PN40, PN64, PN100 and PN160, Confirm by body material, soft seat and pilot configuration, materials, connection standard and set pressure.

Final set pressure, certified relieving capacity, material code and connection standard must be confirmed on the approved datasheet before purchase.

Technical Specifications and Selection Data

Product Model

ZBA46Y/F-16/25/40/64/100/160 C/P/R

Size Range

DN and outlet size per catalog main connection dimension table

Pressure Rating

PN16, PN25, PN40, PN64, PN100 and PN160

Temperature Range

Confirm by body material, soft seat and pilot configuration

Applicable Media

Petroleum, natural gas, chemical, electric power, metallurgy and city gas services

Connection Type

Flanged main valve with pilot tubing

Standards and Compliance

GB/T 12241, GB/T 12242 and GB/T 12243 for safety valve design, performance and test references; model coding follows the JB/T 308 valve model method where applicable.

Engineering Insight: Model Logic and Application Boundary

Model code: A46Y/F = pilot-operated safety relief valve; Y/F identify hard/soft sealing selection; pressure digits identify PN rating; C/P/R identify body material code.

Typical application: pressure vessels and pipelines needing high seat tightness, high back pressure capability, online set pressure verification and adjustable blowdown

Capacity review: Full-lift main valve opens rapidly with low overpressure; final capacity sizing should be calculated from set pressure, medium and required relieving rate.

This product family should not be selected from model code, nominal size or pressure class alone. Confirm the relieving scenario, required capacity, set pressure, operating margin, temperature, back pressure and actual connection standard.

Dimensions and Selection Guide

The table below is transcribed from catalog page 040-042. Verify critical dimensions against the approved order drawing before fabrication or piping release.

Catalog page 041 – Parameter Table 1
NO.	Pa rt Name	do	R	G	Sign Of RL M ateria ls	L1	CM
1 2 3 4 5 6 7 8 10 –	NozzIe	304	304	316	316L	304	MONEL
1 2 3 4 5 6 7 8 10 –	Disc	304 + F46	304 + F46	316 + F46	316L + F46	304 + F46	MONEL+F46
1 2 3 4 5 6 7 8 10 –	Guide	304	304	316	316L	304	MONEL
1 2 3 4 5 6 7 8 10 –	Body	WCB	CF8	CF8M	CF3M	LCB	WCB
1 2 3 4 5 6 7 8 10 –	PIate	C.St	304	316	316L	304	fiC.St
1 2 3 4 5 6 7 8 10 –	Dipper Tube	304	304	316	316L	304	316L
1 2 3 4 5 6 7 8 10 –	Spring	316	316	316	316	316	INCONEL
1 2 3 4 5 6 7 8 10 –	Sea Ring	FKM	FKM	FKM	FKM	FKM	FKM
1 2 3 4 5 6 7 8 10 –	Joint	304	304	316	316	304	316L

Catalog page 042 – Parameter Table 1
Nominal Pressure (PN)	Nominal Diameter (DN)	Nominal Diameter (DN)	do	Column 5	Column 6	Column 7	Column 8	Column 10
//16 25 40	25	32			110		95	355
//16 25 40	25	50	15	1	14		105	382
//16 25 40	32	40	20		115		105	382
//16 25 40	40	50	25		121		124	390
//16 25 40	50	65	32		135		120	430
//16 25 40	50	80	33		124		137	430
//16 25 40	65		40		160		140	440
//16 25 40	80	100	50		162		156	440
//16 25 40	100	125	65		205		160	455
//16 25 40	100	150	65		210		197	455
//16 25 40	150	200	100		241		240	488
//16 25 40	200	250	125		279		276	525
/64 100	25	32	15	1	10		100	372
/64 100	25	50			114			385
/64 100	32	40	20		130	1	10	398
/64 100	40	50	25				124	410
/64 100	50	65	32		160		130	445
/64 100	50	80	32		124		137	458
/64 100	65		40		175		160	485
/64 100	80	100	50		162		162	496
/64 100	100	125	65		195		195	520
/64 100	100	150	65		210		197	538
/64 100	150	200	100		241		246	638
/64 100	200	250	125		279		297	715
160	25	50	13		121		126	445
160	40	50			140		149	460
160	50	80	32				167	490
160	80	100	48		181		191	500
160	100	150	60		233		249	540

RFQ checklist

RFQ checklist: model or valve type, DN/NPS, PN/Class, set pressure, relieving medium, operating temperature, body and trim material, inlet/outlet connection standard, cap/lever/pilot options, quantity, drawing, certificate and inspection requirements.

Failure Analysis, Manufacturing Evidence and Quality Control

Common misapplication risks: incorrect thread or connection standard, insufficient certified relieving capacity, unsuitable body or trim material, operating pressure too close to set pressure, unreviewed back pressure, and installation loads transferred to the valve.

Material review: body materials: WCB, CF8, CF8M or CF3M main valve body options. Trim and internals: 304, 316 or 316L main valve trim with F46 disc assembly options according to material code. Spring and stem: 316 spring in pilot/main valve configuration according to catalog material table.

Testing and inspection: Set pressure calibration, shell strength test, seat tightness/leakage test, reseating/blowdown check, dimensional inspection and material verification can be supplied according to the confirmed standard and order requirements.

Source and scope: product data is based on Zobai Safety Valve Product Catalog.pdf, catalog page 040-042. Project compliance remains subject to the approved datasheet, drawing, calculation and controlled certificates for the ordered configuration.

Review material traceability, type-test scope and project certificate requirements.

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