Detachable Expansion Joint-Henan Shengrun Pipeline Equipment Co., Ltd.

Detachable Expansion Joint

The core features of detachable expansion joints are detachable maintenance, axial thrust transmission, and installation and adjustment. They are essential for pump rooms/valve pipelines, and the seals can be replaced online.

Structural Composition

1. Main body (sleeve): Carbon steel Q235B/stainless steel, with flange, socket short pipe.

2. Telescopic short tube: carbon steel/stainless steel, inserted into the body, adjustable length by sliding.

3. Rubber sealing ring: NBR/EPDM, trapezoidal cross-section, pressure self-tightening seal.

4. Gland Detachable Flange: Key upgrade, loosening bolts allows direct replacement of sealing rings without removing the pipeline.

5. Long force-transmitting screw nut: passes through flanges at both ends, transmits axial thrust, and prevents pull-out.

Working Principle

Power transmission protection: The medium pressure generates axial thrust (blind plate force), which is transmitted through a long screw to the entire pipeline without concentrating on the pump/valve, preventing equipment damage.

Installation and adjustment: The short pipe slides inside the main body, allowing adjustment ± a 30mm installation error, making flange adjustment easier.

Removable seal: The pressure cover is removable; when the sealing ring ages, it is replaced with pressure without needing to cut the pipe, making maintenance fast.

Rigid locking: After tightening the nut, a rigid connection is formed, does not absorb thermal displacement during operation, and only adjusts during installation.

Core Advantages

1. Detachable for maintenance: Seals can be replaced online, eliminating the need for pipe cutting and hot work, reducing maintenance costs by 60%.

2. Reliable force transmission: Long screw balances blind plate force, protecting pump valves and preventing joint tearing.

3. Flexible installation: Fine adjustments in axial/transverse/angular directions to accommodate installation errors and foundation settlement.

4. Stable sealing: Trapezoidal rubber ring, the higher the pressure, the tighter the seal, zero leakage.

5. Durable and long-lasting: Made of carbon steel/stainless steel, corrosion-resistant and vibration-resistant, with a lifespan of 15–20 years.

Application Scenarios

1. Pump room/pump station: pump inlet and outlet, protect the pump body and prevent pull-out.

2. Valve/Water Meter: Both ends of the valve are connected, making it easy to disassemble and transmit power.

3. Municipal water supply and drainage: main pipes and long-distance pipelines, transmitting thrust.

4. Wastewater treatment/chemicals: contains particulate/corrosive media, corrosion-resistant and easy to maintain.

5. High-rise buildings: high-pressure water supply pipelines to balance blind plate forces.

Key Installation Points

1. Adjust the length: When installing, slide the short pipe to the appropriate length and reserve an adjustment amount.

2. Bolt tightening: The force-transmitting screw is tightened evenly diagonally, pre-tightening and then tightening to prevent uneven loading.

3. Sealing inspection: Gland bolts are tightened evenly, rubber rings are pressed tight without leaks, and slide smoothly.

4. Bracket Setup: Fixed brackets are installed at both ends to balance internal pressure thrust.

5. Maintenance space: 300mm ≥ space on the gland side for easy removal and replacement of the sealing ring.

Technical Specifications

Detachable-expansion-joint-11

serial number	name	quantity	Material
1	Ontology	1	QT400-15、Q235A、ZG230-450、20
2	sealing ring	1	NBR
3	Gland	1	QT400-15、Q235A、ZG230-450、20
4	Limiting short pipe	1	Q235A、20、16Mn
5	studs	n	Q235A、35、1Cr18Ni9Ti
6	nut	5n	Q235A、20、1Cr18Ni9Ti

Nominal diameter DN	Pipe outer diameter Dw	Overall dimensions		Flange connection size
		Overall dimensions		0.6MPa				1.0MPa
		L	L1	D	D1	n-Th	b	D	D1	n-Th	b
65	76	400	40	160	130	4-M12	16	185	145	4-M16	20
80	89			190	150	4-M16	18	200	160	8-M16	22
100	114			210	170	4-M16	18	220	180		24
125	140			240	200	8-M16	20	250	210		26
150	168			265	225		20	285	240	8-M20	26
200	219			320	280		22	340	295	8-M20	28
250	273			375	335	12-M16	24	395	350	12-M20
300	325	420	50	440	395	12-M20	24	445	400	12-M20
350	377			490	445	12-M20	26	505	460	16-M20	30
400	426			540	495	16-M20	28	565	515	16-M24	32
450	480			595	550	16-M20	28	615	565	20-M24	32
500	530			645	600	20-M20	30	670	620	20-M24	34
600	630	440		755	705	20-M24	30	780	725	20-M27	36
700	720	440		860	810	24-M24	32	895	840	24-M27	40
800	820	600	60	975	920	24-M27	34	1015	950	24-M30	44
900	920			1075	1020	24-M27	36	1115	1050	28-M30	46
1000	1020			1175	1120	28-M27	36	1230	1160	28-M33	50
1200	1220	650		1405	1340	32-M30	40	1455	1380	32-M36	56
1400	1420	650		1630	1560	36-M33	44	1675	1590	36-M39	62
1600	1620	670		1830	1760	40-M33	48	1915	1820	40-M45	68
1800	1820	670		2045	1970	44-M36	50	2115	2020	44-M45	70
2000	2020	700		2265	2180	48-M39	54	2325	2230	48-M45	74
2200	2220	730		2475	2390	52-M39	60	2550	2440	52-M52	80
2400	2420	730		2685	2600	56-M39	62	2760	2650	56-M52	82
2600	2620	840	80	2905	2810	60-M45	64	2960	2850	60-M52	88
2800	2820			3115	3020	64-M45	68	3180	3070	64-M52	94
3000	3020			3315	3220	68-M45	70	3405	3290	68-M56	100
3200	3220			3525	3430	72-M45	76
Instructions: After installation on the pipeline, this product is limited according to the required expansion distance. Tightening the nut causes the elastic sealing rings to press against the outer ring of the pipe at an angle under the pressure of the nut cap, providing a seal and connection. It is mainly used to connect to pipeline valves, not only providing pipeline compensation but also facilitating valve maintenance and replacement. Production range: DN32-4000.