ZBFA72W-10P/R Vacuum Negative Pressure Safety Valve

Vacuum Negative Pressure Safety Valve for negative-pressure vessels and systems where air must be admitted automatically to prevent vacuum damage. Key selection data include DN20-DN250, PN10, Confirm by vessel medium and material 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

ZBFA72W-10P/R

Size Range

DN20-DN250

Pressure Rating

PN10

Temperature Range

Confirm by vessel medium and material configuration

Applicable Media

Air intake for vacuum relief; corrosive vessel service such as absorption tower, distillation tower, storage tank and vessel systems

Connection Type

Flanged connection

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: FA72W = vacuum negative pressure safety valve; P/R identify stainless material options; 10 identifies PN10 rating.

Typical application: negative-pressure vessels and systems where air must be admitted automatically to prevent vacuum damage

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

Catalog page 036 – Parameter Table 1
Nominal Diameter (DN)	Nominal Diameter (DN)	do	G1	G	L	Approx. H
20 32 40 50 80 100 125 150 200 250	95	65	45	46126	14	230
20 32 40 50 80 100 125 150 200 250	105	75	55	4.14	16	230
20 32 40 50 80 100 125 150 200 250	1 1 5	85	65	46126	16	230
20 32 40 50 80 100 125 150 200 250	140	100	78	4.18	16	230
20 32 40 50 80 100 125 150 200 250	150	1 10	85	46130	16	230
20 32 40 50 80 100 125 150 200 250	160	125	100	4.18		240
20 32 40 50 80 100 125 150 200 250	200	160	135	4.18	20	255
20 32 40 50 80 100 125 150 200 250	220	180	155	8.18	20	265
20 32 40 50 80 100 125 150 200 250	250	210	185	8.18	22	325
20 32 40 50 80 100 125 150 200 250	285	240	210	46257	24	365
20 32 40 50 80 100 125 150 200 250	340	295	265	8.23	24	465
20 32 40 50 80 100 125 150 200 250	395	350	320	46379	25	550

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: P/R stainless steel material options for corrosive vessel service. Trim and internals: Corrosion-resistant trim selected by medium. 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 36. 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.

ZBA46 Series Pilot Operated Safety Valves

Pilot operated safety valves for higher-pressure service requiring tighter sealing and stable set pressure performance.

ZBWA42 Series Bellows Balanced Safety Valves

Bellows balanced safety valves for back pressure applications where stable performance is important.

ZBA68 Series High Temperature Steam Safety Valves

High temperature steam safety valves for boilers, steam lines, and other elevated-temperature systems.

SVL488 Series Sanitary Safety Valves

Sanitary safety valves for hygienic process lines and cleaning systems requiring cleanable pressure protection.