Ductile Iron 90° Reducing Elbow — Turn and Reduce in One Fitting

By Nico Yin · Qingdao Zhaoyuqi Machinery Co., Ltd.

Overview

A 90° reducing elbow changes the direction of a pipeline through a right angle while stepping the pipe size down from a larger inlet to a smaller outlet — for example 2" × 1-1/4". Traditionally this job needs two components: a standard elbow plus a reducing coupling or bushing, which adds a joint, two extra threaded seals, and installation time. A one-piece reducing elbow removes those leak paths entirely and shortens the assembled line length, which is why plant designers reach for it whenever space around manifolds and equipment nozzles is limited.

The fittings are sand-cast in ductile iron to ASTM A536-84(2019), whose combination of strength and elongation gives threaded fittings good resistance to cracking during make-up. Common uses include pump and tank nozzle transitions, meter and gauge take-offs, branch size reductions on fire and water lines, and OEM equipment plumbing where a compact, single-casting transition simplifies assembly. Size combinations are highly flexible — from 1/2" × 1/2" (equal, on request) up to 4" × 2" in threaded form, and larger flanged combinations can be quoted from drawings.

Specifications

Customization & Sampling

The core value of this product is the size matrix, and we cast to your combinations rather than a fixed catalog list. Send the inlet × outlet schedule and we will confirm which can be produced from existing patterns and which need new cores — the sampling flow is then drawing review → core/tooling setup → first article → thread and dimension gauging → pilot batch → production. First samples typically ship in 2–4 weeks. We can also mix end styles: male outlet, flanged outlet, or grooved ends for grooved coupling systems.

Quality Inspection & Packaging

Each melt is verified by optical emission spectrometry against the A536 chemistry band, with mechanical properties from cast test coupons. Dimensional inspection covers both thread sets independently (GO/NO-GO gauges), the alignment of the waterway taper, and overall face-to-face dimensions; wall thickness is spot-checked at the heel and the reduction cone. Pneumatic leak testing can be applied to sampled lots when specified. Finished parts are bagged, boxed per size combination, and packed in plywood cases or on pallets for export. Production is run under a quality management system conforming to ISO 9001:2015 requirements.

FAQ

Q1: Which size combinations are available off the shelf?

The most common combinations — 2"×1-1/2", 2"×1-1/4", 1-1/2"×1", 3"×2" and similar single-step reductions — can usually be quoted from existing tooling. Less common pairs are cast to order after a short pattern check; send your full list for a matrix quote.

Q2: Is the reducing elbow stronger than elbow-plus-reducer assemblies?

Mechanically the win is fewer joints: each threaded connection is a potential leak and stress point. A single casting to ASTM A536 also avoids the galvanic and thread-fit issues of mixing components from different suppliers.

Q3: Can the outlet be a male (street) thread?

Yes, a male outlet or male inlet version can be cast and machined — useful where the fitting screws straight into a valve or pump port. This combination is quoted as a variant of the standard body.

Related Products

• Concentric Reducer

• Reducing Coupling

• Elbow (Standard 90°)

• 90° Long Radius Elbow

• Reducing Tee

Get a Quote

Reducing elbows are quoted fastest when you send the complete inlet × outlet schedule at once. WhatsApp usWhatsApp us at +86 185 6156 7088 the list, thread standard, and coating; we respond with a per-combination price sheet, sample plan, and production lead time — usually within one working day. Distributor pricing and private-label packing are available for recurring programs.

Need a formal quotation? Send your Ductile Iron 90° Reducing Elbow drawing, quantity and target price through our request for quotation form — it goes straight to the foundry inbox, and we reply with a priced offer, material certificate draft and production lead time within one business day.