Stuffing-box expansion joint

The stuffing-box expansion joint is the most reliable, time-tested engineering device for absorbing the thermal expansion and contraction of metal (thermal deformation) on high-temperature trunk pipelines.

Working pressure: up to 10 kgf/cm² (1 MPa)
Diameters: DN 100 – DN 1400
Compensation: 200–600mm
Standard: Series 4.903-10, 5.903-13

Parts and materials

1Body — to be confirmed
2Gland packing — Asbestos or graphite cord, or graphite-PTFE
3Rubber ring — to be confirmed
4Gland flange — to be confirmed
5Sleeve pipe — to be confirmed
6Studs and nuts — to be confirmed

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PDF catalogue

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How it works

The expansion joint works on a telescopic principle:

1It consists of two main parts: an outer housing and an inner spigot pipe that slides into it.
2A stuffing-box seal (asbestos or graphite cord, or graphite–PTFE packing) sits between them so pressure and the working medium don't escape as the pipes move. Long external bolts and nuts compress this seal to keep the joint tight.

Working pressure

In line with standard industrial norms (Series 4.903-10 and Series 5.903-13), stuffing-box expansion joints are designed to operate under the following conditions:

Maximum working pressure (PN): up to 10 kgf/cm² (1 MPa).

Technical specifications

Products can also be manufactured to the customer's drawings and technical requirements, including larger diameters.

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Send us the diameter, operating conditions and timeline — we will reply with an engineering review and an indicative price.

Size tables

Data from the 2025 factory catalogue. All dimensions in mm. Products can be manufactured to the customer's drawings and technical requirements, including larger diameters, based on the specific operating conditions.

Stuffing-box expansion joints — standard dimensions

Nominal diameter (DN)	Outer diameter (OD), mm	Compensation capacity, mm	Approximate weight, kg
DN 100	108	200	~25–35
DN 200	219	200–300	~50–70
DN 300	325	200–400	~90–130
DN 400	426	300–400	~160–210
DN 500	529	300–450	~240–280
DN 600	630	300–450	~320–390
DN 800	820	400–500	~550–680
DN 1000–1400	1020–1420	500–600	more than 900 kg

Weight is approximate; the exact figure depends on order parameters.

Advantages

Greater compensation range
Absorbs a far greater pipeline elongation (travel) than other expansion joint types, such as bellows or rubber ones.
Easy to service
When the packing wears out, it's repaired without cutting the pipe — just loosen the bolts and add fresh packing.
Cost-effective
On large-diameter pipelines it is significantly cheaper than bellows expansion joints and the more economical choice.