(High-Pressure) Post-Valve Maintenance Bellows Expansion Joint

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Hydraulic and Hydroelectric Expansion Joints

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1. Simplified Product Structure Diagram

2. Product Code Designation

3. Product Structure Features

The expansion joint consists of two interface flanges, two ring‑plate flanges, a set of load‑bearing tie rods, two end nozzles, and a bellows. It is located downstream of the valve and can be lifted out after pre‑compressing the expansion joint to create a gap during valve maintenance.

FHSDFJ Post-Valve Expansion Joint (Force-Transmission Type)

Pressure: 1.6 MPa; Design Temperature: 20°C

Nominal Diameter DN	Bellows		Adjustment amount mm	Stiffness N/mm	Inner diameter × wall thickness	Maximum radial dimension, mm	Total length mm
Nominal Diameter DN	Effective area m²	Wave number n	Adjustment amount mm	Stiffness N/mm	Inner diameter × wall thickness	Maximum radial dimension, mm	Total length mm
DN200	0.0474	3	30	747.36	219 × 6	400	400
DN300	0.1180	3	30	2331.03	377 × 7	530	400
DN400	0.1708	3	30	1219.55	426 × 8	640	450
DN500	0.2387	3	40	1436	530×8	800	500
DN600	0.3585	3	40	1457	630×10	950	500
DN700	0.4931	3	40	2156	720×10	1050	600
DN800	0.6283	3	40	1807	820×12	1150	600
DN900	0.7766	3	40	3461	920×14	1260	600
DN1000	0.9414	3	60	3741	1020×14	1360	800
DN1200	1.305	3	60	3022.02	1220×16	1800	800
DN1400	1.7413	3	60	3431.16	1420×16	2300	1000
DN1600	2.2448	3	60	6666.51	1620×18	2100	1000
DN1800	2.8162	3	70	5034.4	1820×20	2130	1200
DN2000	3.4425	3	70	5520.85	1220×22	2345	1200

Note: 1. The pipe connection material and thickness in the table are based on Q355R material.
2. The product pressures and diameters listed in the table represent only some of the commonly used specifications; however, we can also manufacture products with operating pressures ranging from 1.0 MPa to 10.0 MPa based on actual project requirements.

Pressure: 2.5 MPa; Design Temperature: 20°C

Nominal Diameter DN	Bellows		Adjustment amount mm	Stiffness N/mm	Inner diameter × wall thickness	Maximum radial dimension, mm	Total length mm
Nominal Diameter DN	Effective area m²	Wave number n	Adjustment amount mm	Stiffness N/mm	Inner diameter × wall thickness	Maximum radial dimension, mm	Total length mm
DN200	0.0474	3	30	1617.35	219 × 7	400	400
DN300	0.1180	3	30	2368.06	377 × 9	530	400
DN400	0.1708	3	30	1519.31	426×10	640	450
DN500	0.2387	3	40	1380.57	530×12	800	500
DN600	0.3585	3	40	1783.76	630×12	950	500
DN700	0.4931	3	40	1942.06	720×14	1050	600
DN800	0.6283	3	40	2119.94	820×16	1150	600
DN900	0.7766	3	40	2295.44	920×16	1260	600
DN1000	0.9414	3	60	2509.	1020×18	1360	800
DN1200	1.305	3	60	3161.48	1220×18	1800	800
DN1400	1.7413	3	60	3886.27	1420×20	2300	1000
DN1600	2.2448	3	60	4344.88	1620×22	2100	1000
DN1800	2.8189	3	70	9655.6	1820×22	2195	1200
DN2000	3.4455	3	70	10665.15	1220×24	2425	1200

Pressure: 4.0 MPa; Design Temperature: 20°C

Nominal Diameter DN	Bellows		Compensation amount mm	Stiffness N/mm	Inner diameter × wall thickness	Maximum radial dimension, mm	Total length mm
Nominal Diameter DN	Effective area m²	Wave number n	Compensation amount mm	Stiffness N/mm	Inner diameter × wall thickness	Maximum radial dimension, mm	Total length mm
DN200	0.0477	3	30	3230.58	219×10	400	400
DN300	0.1035	3	30	3463.1	377×10	530	400
DN400	0.1724	3	30	5263.66	426 × 14	640	450
DN500	0.2629	3	40	6231.77	530×14	800	500
DN600	0.3724	3	40	5222.05	630×14	950	500
DN700	0.4761	3	40	5686.54	720×14	1050	600
DN800	0.6063	3	40	6208.3	820×18	1150	600
DN900	0.7521	3	40	6732.67	920×18	1260	600
DN1000	0.9137	3	60	7301.69	1020×20	1360	800
DN1200	1.309	3	60	10910.4	1220×20	1800	800
DN1400	1.746	3	60	12523	1420×22	2300	1000
DN1600	2.2458	3	60	14202.5	1620×25	2100	1000
DN1800	2.8234	3	70	22499.96	1820×28	2300	1200
DN2000	3.4504	3	70	24878.57	1220×30	2600	1200