ZBA42Y-16/25/40/64/100 C/P/R Spring Full Lift Enclosed Safety Valve

Spring Full Lift Enclosed Safety Valve for general pressure vessels and pipelines requiring high discharge full-lift overpressure protection. Key selection data include DN20-DN400 for PN16/25/40; DN20-DN150 for PN64/100, confirm by table, PN16, PN25, PN40, PN64 and PN100, C type up to 300 deg C; P/R type up to 200 deg C, 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

ZBA42Y-16/25/40/64/100 C/P/R

Size Range

DN20-DN400 for PN16/25/40; DN20-DN150 for PN64/100, confirm by table

Pressure Rating

PN16, PN25, PN40, PN64 and PN100

Temperature Range

C type up to 300 deg C; P/R type up to 200 deg C

Applicable Media

Air, petroleum gas, liquids and corrosive media depending on material

Connection Type

Flanged inlet and outlet

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: A42 = flanged safety valve with full-lift enclosed spring structure. Y identifies hard alloy sealing surface; C/P/R identify body material code.

Typical application: general pressure vessels and pipelines requiring high discharge full-lift overpressure protection

Capacity review: Main connection dimensions are listed on the source catalog page. Discharge capacity and orifice sizing should be confirmed by set pressure, medium, temperature and applicable code.

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 20. Verify critical dimensions against the approved order drawing before fabrication or piping release.

Catalog page 020 – Parameter Table 1
Nominal Pressure (PN)	( DN)	do	Nominal Diameter (DN)	L	L1	Approx. H
16/25/40	20	15	25	110	95	281
16/25/40	25	1 6	32	110	95	281
16/25/40	32	20	40	115	100	285
16/25/40	40	25	50	120	1 1 0	295
16/25/40	50	32	65	135	120	305
16/25/40	65	40	80	160	140	394
16/25/40	80	50	100	170	135	406
16/25/40	100	65	125	205	160	511
16/25/40	125	80	150	210	190	586
16/25/40	150	100	175	255	230	601
16/25/40	200	125	250	305	260	734
16/25/40	250	150	300	350	320	928
16/25/40	300	200	400	370	350	1 159
16/25/40	350	250	500	375	415	1314
16/25/40	400	280	500	395	415	1530
/64 100	20	12	25	110	100	276
/64 100	25	16	32	110	100	276
/64 100	32	20	40	130	1 1 0	287
/64 100	40	25	50	135	120	292
/64 100	50	32	65	160	130	383
/64 100	65	40	80	175	160	497
/64 100	80	50	100	175	160	489
/64 100	100	65	125	195	195	562
/64 100	150	100	200	285	260	832

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 carbon steel, ZG15Cr1Mo alloy steel, ZG15Cr1Mo1V/ZG20Cr1Mo1V high-temperature alloy steel, CF8/304, CF8M/316 or CF3M/316L according to model body code and service. Trim and internals: 20Cr13, 304, 316, 316L or alloy trim according to body code and medium; corrosive or high-temperature service can use stainless or alloy internals. Spring and stem: 50CrVA spring for standard service; stainless or coated fluoroplastic/304 spring options for corrosive service where specified.

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 20. 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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