Are Vajra valves equivalent to Durco in terms of certifications?

Vajra valves carry the same API 6D, API 607, ASME B16.34, and relevant international certifications as Durco-equivalent products. Material traceability with EN 10204 3.1 mill certificates is provided on all orders.

Home Valve AlternativesDurco

Valve AlternativeOrigin: USAEst. 1912

Durco Valve Alternative

Durco International / Flowserve Durco (Mark Controls)

Durco International (now part of Flowserve Corporation as Flowserve Durco) is the specialist in highly corrosion-resistant alloy valves for the chemical, petrochemical, pulp & paper, and pharmaceutical industries. The Durco Mark 3 globe valve and Durco butterfly valve in CN7M (Alloy 20), Hastelloy C-276, and PVDF-lined configurations are specified for concentrated sulphuric acid, hydrochloric acid, chlorine dioxide, and chloride-bearing process streams. Vajra Industrial Solutions supplies technically equivalent corrosion-resistant alloy valves in ASTM A351 CN7M (Alloy 20), Hastelloy C-276, Monel 400, and titanium Grade 2 materials — covering globe valves, ball valves, butterfly valves, and check valves for aggressive chemical service.

Legal DisclaimerDurco and Flowserve Durco are registered trademarks of Flowserve Corporation. Vajra Industrial Solutions is not affiliated with, endorsed by, or a distributor of Flowserve/Durco products. We supply independent valves to equivalent or superior specifications.

Why Consider Durco Alternatives?

Durco/Flowserve Durco specialty alloy valves carry large import premiums (often 4–8× base equivalent) for Alloy 20, C-276, and Ti-Grade 2 materials

Indian chemical and fertiliser plants (sulphuric acid, phosphoric acid, hydrochloric acid service) seeking CN7M and C-276 valves from domestic sources

Gulf and global EPC projects requiring Alloy 20 or Hastelloy C-276 valves without Flowserve import lead times (often 20–28 weeks for exotic alloys)

Replacement valves for existing Durco-specified plants where alloy and pressure class (not brand) drives the specification

Durco → Vajra Equivalence Reference

Indicative equivalences for common Durco valve series. Dimensional and specification compatibility must be verified by the project engineer before substitution.

Type	Durco Series	Vajra Equivalent	Notes
Globe Valve	Durco Mark 3 Globe Valve (CN7M / Alloy 20)	Alloy 20 CN7M Globe Valve — ASME B16.34 Class 150–300	ASTM A351 CN7M, Class 150–300, flanged RF/RTJ, sulphuric acid service
Butterfly Valve	Durco Lined Butterfly Valve (PVDF/PTFE lined)	PVDF-Lined Butterfly Valve — ASME B16.34	CS body + PVDF liner, PTFE seat, DN50–DN300, chlorine/HCl service
Ball Valve	Durco Hastelloy C-276 Ball Valve	Hastelloy C-276 Ball Valve — ASME B16.34 Class 150–600	ASTM A494 CW-6M, Class 150–600, flanged, mixed acid and HF service
Globe Valve	Durco Titanium Globe Valve (Ti Grade 2)	Titanium Grade 2 Globe Valve — ASME B16.34	ASTM B367 Grade 2, seawater and oxidising acid service, Class 150

Why Choose Vajra

ASTM A351 CN7M (Alloy 20), CW-6M (Hastelloy C-276), and A890 5A (Super Duplex) globe, gate, ball, and butterfly valves

Titanium Grade 2 valves for concentrated nitric acid and bleach (NaOCl) service

PVDF-lined and PTFE-lined butterfly valves and ball valves for chlorine, hydrofluoric acid, and aggressive oxidising service

EN 10204 3.1 MTCs with chemistry and mechanical properties, NACE MR0103 hardness compliance certificates

15–20 week lead time for exotic alloy specials versus 20–28 weeks for Flowserve Durco import

Certifications & Standards

API 6DAPI 607 (Fire Safe)ASME B16.34API 598EN 10204 3.1IBR (Indian Boiler)ISO 9001:2015NACE MR0175

Common Applications

Sulphuric acid (≥98%) plant absorption tower and storage tank valves — CN7M bodyChlorine dioxide bleach plant valves — Hastelloy C-276 or PVDF-lined butterflyHydrofluoric acid alkylation unit valve replacement — Monel 400 body and trimPhosphoric acid wet-process evaporator valves — titanium Grade 2 globe valves

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