A safety valve discharge elbow is the fitting that connects the outlet of a safety or relief valve to the discharge piping. Unlike a plain elbow, its inlet and outlet axes are offset so that the discharge pipe does not impose bending stress on the valve body — a critical detail, because a rigidly loaded valve body can distort the seat and compromise the valve's set-pressure accuracy. Our discharge elbows are threaded for direct make-up to the valve outlet flange or nipple, cast in ductile iron to ASTM A536-84(2019) for strength and impact resistance.
The fitting is standard practice on steam boilers, air receivers, pressure vessels, and pump relief loops wherever code-compliant discharge piping is required. The offset geometry also simplifies alignment during installation: the discharge riser can be run vertically or laterally without forcing the valve into position. Typical sizes are 3/4" to 4" with NPT threads per ASME B1.20.1, BSP available for export equipment. For steam service above our ductile iron temperature range, we advise confirming the medium conditions with our engineers before ordering.
| Parameter | Typical Value |
|---|---|
| Material & Grade | ASTM A536-84(2019) Gr. 65-45-12 / 80-55-06; EN-GJS-400-15 / EN-GJS-450-10 (EN 1563) |
| Standard | Fitting geometry per customer/safety-valve manufacturer outlet drawings; threads per ASME B1.20.1 (NPT) or ISO 7 (BSP) |
| Nominal Sizes | 3/4" – 4" |
| Pressure Rating | 300 PSI WOG (typical; verify against system relief conditions) |
| Thread | NPT or BSP, threaded inlet × threaded outlet, offset axes |
| Offset | Per valve outlet pattern; matched to drawing |
| Wall Thickness | Sized for pressure class; reinforced at threaded bosses |
| Weight Range | Approx. 0.5 – 5 kg per piece |
| Casting Process | Green sand casting; threads and seating faces fully machined |
| Dimensional Tolerance | ISO 8062 CT10–CT12 (as-cast); threads to gauge |
| Surface Finish | Black bituminous paint; hot-dip galvanized; high-temp paint on request |
Because valve outlet patterns differ between manufacturers, this fitting is almost always produced to a drawing or a sample valve: we match the inlet thread, the offset dimension, and the outlet angle to your specific valve model. The flow is drawing/sample review → pattern or core work → first article → thread and offset inspection → pilot batch → production. First samples are typically ready in 2–4 weeks. Multiple valve brands can be covered from one enquiry if you list the outlet dimensions for each.
Each melt is checked by optical emission spectrometry against the A536 chemistry window, with mechanical coupons confirming tensile and elongation. Inspection focuses on the features that make this fitting work: thread gauges on both ends, the offset dimension between axes, squareness of the outlet face, and wall thickness at the bend. Pneumatic leak testing can be applied to sampled lots for steam-adjacent service. Parts are individually bagged, packed in export plywood cases or on pallets, and protected against thread damage in transit. The factory operates a quality management system conforming to ISO 9001:2015 requirements.
Q1: Why can't a normal elbow be used on a safety valve outlet?
A plain elbow aligns the discharge pipe with the valve outlet axis and can transfer pipe strain directly into the valve body, risking seat distortion and set-pressure drift. The offset design of a discharge elbow lets the discharge piping stand off from the valve, absorbing alignment mismatch.
Q2: Is this fitting suitable for steam service?
Ductile iron has temperature limits; for saturated steam at elevated pressure, steel or malleable iron is usually specified. Send us your steam pressure and temperature and we will confirm suitability or propose an alternative material before you order.
Q3: Can you match a specific valve brand's outlet pattern?
Yes — we routinely produce to valve-maker outlet dimensions. Provide the valve model, outlet size, and a sketch or sample of the connection, and the first article will be gauged against your valve before mass production.
Safety valve discharge elbows are quoted from drawings or valve data — WhatsApp usWhatsApp us at +86 185 6156 7088 a photo of the valve outlet, the thread size, and annual quantity, and we will confirm manufacturability and price, usually within one working day. OEM valve manufacturers and boiler assemblers are welcome to request framework pricing for recurring volumes.
Need a formal quotation? Send your Threaded Safety Valve Discharge Elbow drawing, quantity and target price through our quotation request 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.
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Jimo District, Qingdao City, Shandong Province, China
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