ZBA37H/ZBA43H-16/25/40 C Dual Spring Safety Valve
Dual Spring Safety Valve for systems requiring two same-size safety valves on a shared Y-type inlet for higher discharge or duty arrangement. Key selection data include Y-connector nominal size per catalog combination table, PN16, PN25 and PN40, Up to 350 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.
- Size range: Y-connector nominal size per catalog combination table
- Pressure rating: PN16, PN25 and PN40
- Temperature: Up to 350 deg C
- Connection: Flanged Y-type dual valve assembly
- Media: Steam and air
- Drawings, test records and material documents confirmed for the ordered configuration.
Technical Specifications and Selection Data
Product Model
ZBA37H/ZBA43H-16/25/40 C
Size Range
Y-connector nominal size per catalog combination table
Pressure Rating
PN16, PN25 and PN40
Temperature Range
Up to 350 deg C
Applicable Media
Steam and air
Connection Type
Flanged Y-type dual valve assembly
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: A37/A43 = dual spring safety valve assembly. The nominal DN refers to the Y-connector inlet; paired valve size follows the combination table.
Typical application: systems requiring two same-size safety valves on a shared Y-type inlet for higher discharge or duty arrangement
Capacity review: Discharge and dimensions depend on the selected Y-connector and paired A47H valve combination.
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 23. Verify critical dimensions against the approved order drawing before fabrication or piping release.
| Type / Model | Nominal Diameter (DN) | do | R | G | Nominal Diameter (DN) | do | Approx. H |
|---|---|---|---|---|---|---|---|
| A37H-16/25/40C | 50 | 1 15 | 225 | 165 | 32 | 2×25 | 310 |
| A37H-16/25/40C | 80 | 140 | 310 | 205 | 65 | 2×50 | 415 |
| A37H-16/25/40C | 100 | 160 | 355 | 255 | 80 | 2×65 | 420 |
| A37H-16/25/40C | 125 | 170 | 400 | 275 | 100 | 2×80 | 540 |
| A37H-16/25/40C | 150 | 190 | 440 | 300 | 125 | 2×100 | 625 |
| A43H-16/25/40C | 50 | 1 15 | 225 | 165 | 32 | 2×25 | 310 |
| A43H-16/25/40C | 80 | 135 | 285 | 190 | 50 | 2×40 | 380 |
| A43H-16/25/40C | 100 | 160 | 355 | 255 | 80 | 2×65 | 420 |
| A43H-16/25/40C | 125 | 170 | 400 | 275 | 100 | 2×80 | 540 |
| A43H-16/25/40C | 150 | 190 | 440 | 300 | 125 | 2×100 | 625 |
| A37H A37H Type A47H Relevant A47H Type A43H A43H Type A47H Relevant A47H Type | ( Nominal | DN ) Diameter | 50 | 80 | 100 | 125 | 150 |
| A37H A37H Type A47H Relevant A47H Type A43H A43H Type A47H Relevant A47H Type | Nominal | ( DN ) Diameter | 32 | 65 | 80 | 100 | 125 |
| A37H A37H Type A47H Relevant A47H Type A43H A43H Type A47H Relevant A47H Type | ( DN Nominal | ) Diameter | 50 | 80 | 100 | 125 | 150 |
| A37H A37H Type A47H Relevant A47H Type A43H A43H Type A47H Relevant A47H Type | Nominal | ( DN ) Diameter | 32 | 65 | 80 | 100 | 125 |
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: Y-connector material WCB; other valve materials follow A47H spring safety valve configuration. Trim and internals: Same main trim family as A47H, with hard sealing surface options according to order. 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 23. 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.
Related Products
FAQ
Safety Valve FAQs
What models are covered by this ZBA37H/ZBA43H-16/25/40 C Dual Spring Safety Valve page?
ZBA37H/ZBA43H-16/25/40 C
What size, pressure and temperature data should be confirmed?
Size: Y-connector nominal size per catalog combination table. Pressure: PN16, PN25 and PN40. Temperature: Up to 350 deg C. Confirm the exact combination for the selected model.
Which media can this product family handle?
Steam and air. Material and sealing compatibility require review for the actual fluid composition and temperature.
Can the catalog dimension table be used for final fabrication?
Use it for preliminary review only. Confirm critical dimensions, connection details and orientation on the approved order drawing before piping or equipment fabrication.
What should be included in the RFQ?
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.