Storage Tank Hydraulic Slowly-Closing Check Butterfly Valve

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Storage Tank Hydraulic Slowly-Closing Check Butterfly Valve

Nominal Diameter: DN250 ~ 2600
Nominal: PN2.5 ~ 4.0MPa
Medium Temperature: ≤80 °C
Fast closing angle: 65° ± 10°
Slow cut angle: 25° ± 10°
Full open state Minimum flow resistance coefficient: 0.1
Optional Control power: AC220V, DC220V, DC110V, DC24V

Product Overview

Storage tank hydraulic slowly-closing check butterfly valve is a newly developed product, based on the digestion and absorption of advanced European technologies in hydraulic control. It is a next-generation hydraulic valve that integrates both check and control functions. It is specially designed for systems requiring fast shut-off and backflow prevention, making it ideal for pump stations and pipeline networks vulnerable to water hammer.

This valve achieves controlled two-stage closing (fast + slow) to eliminate water hammer and protect pipelines and pumps—an optimal solution for fluid control systems.

Product Features

Storage tank hydraulic slowly-closing check butterfly valve replaces traditional water hammer mitigation equipment with a compact, efficient design. It absorbs and converts the energy of water hammer into stored potential energy, which not only reduces energy loss but also extends service life. Its built-in hydraulic pressure regulation system ensures safe and reliable operation, eliminating the need for frequent maintenance or large infrastructure.

Key features:

Compact structure and low weight
Stable operation and flexible motion
Simple and modular design
Easy to install and maintain
Long service life
Energy saving and reduced operational costs

The integrated hydraulic and electric control systems allow manual, semi-automatic, and fully automatic operations. The valve can be fully open, semi-open, or fully closed—ideal for applications requiring high adaptability. Control units can be built-in or installed externally for flexible site installation and visual monitoring.

◆ Working Principle

1. Routine Work

(1) Valve Open:

Start the motor-driven oil pump. The hydraulic oil flows through the filter, pump, and check valve into the oil tank of the swing mechanism, increasing pressure. Once the set pressure is reached, the solenoid valve energizes and pushes oil to the swing cylinder. The swing arm rotates, driving the disc to the open position. After that, the solenoid valve deactivates, and oil returns to the tank. The valve is now open and ready for operation.

(2) Valve Close:

When the solenoid valve is energized, hydraulic pressure flows from the tank into the front end of the swing cylinder, pushing the oil back and causing the disc to begin closing. The closing speed is controlled by the set closing program (two-stage—fast and slow), ensuring a gradual shut-off to prevent water hammer.

(3) Emergency Shut-off:

In emergencies, operators can manually shut off the valve using a lever or crank handle. The valve closes completely once the oil returns to the tank.

2. Oil pump pressure control:

The electric oil pump provides pressure to open and close the valve. When closing the valve, the oil is pushed into the oil storage tank, shutting the valve either manually or automatically (refer to schematic J1 or J2). When opening, the oil returns from the tank to the swing cylinder.

3. Manual hand pump operation:

If power is lost, the electric oil pump can be turned off manually or electrically. The manual hand pump may be used to open or close the valve in an emergency.

4. Oil tank pressure regulation:

In normal operation, the hydraulic oil storage tank remains pressurized. If the system detects a pressure drop (due to leakage or depletion below the rated threshold), the pressure controller automatically activates the oil pump to restore pressure.

For DN ≤ 900: Pump maintenance interval ≥ 300 hours
For DN ≥ 1000: Pump maintenance interval ≥ 500 hours

5. Valve and pump interlock protection:

If the solenoid valve fails or is misused, an interlock trip signal is activated to stop the oil pump, ensuring system safety.

Specification Parameters

◆ Basic Parameters

Nominal Pressure PN (MPa)	Test Pressure Ps (MPa)	Working Temperature	Applicable Medium
	Seal	Strength	Dx7K41X–2.5 / 6 / 10
1.0	1.1	1.5	≤ 80°C
0.6	0.66	0.9	≤ 250°C
0.25	0.275	0.375	≤ 250°C

◆ Special Parameters

Parameter	DN ≤ 1200	DN ≥ 1400
Valve open time (s)	10–60	30–120
Valve close time – Fast (s)	1.2–2.5	2–3.0
Valve close time – Slow (s)	2–60	4–60
Valve closing angle – Fast	65° ± 10°	65° ± 10°
Valve closing angle – Slow	25° ± 10°	25° ± 10°

◆ Main Components Material

Part Name	Dx7K41X–2.5 / 6 / 10	Dx7K41H–2.5C / 6C / 10C
Body, Disc	Grey cast iron	Carbon steel
Valve Shaft	Stainless steel	Stainless steel
Body Seal	Brass	Stainless steel
Disc Ring	NBR Oil-resistant rubber	Stainless steel

◆ Main Dimensions

■ Model: Dx7K41H–2.5

DN (mm)	D	D1	D2	b	L1	L2	B	B1	H	H1	n–Φ	Z–M	n–d	Flange Standard	Weight (kg)
600	765	670	705	30	565	1427	/	960	460	1425	16–26	4–24	2–26	XL6.3	1100
700	880	776	810	30	640	1556	/	960	540	1425	20–26	4–24	2–30	XL6.3	1420
800	975	880	920	30	740	1723	/	1135	580	1665	20–30	4–27	2–30	XL10	1870
900	1075	980	1020	30	820	1850	130	1135	630	1665	20–30	4–27	2–30	XL10	2100
1000	1175	1080	1120	30	900	1960	160	1135	690	1665	24–30	4–27	4–30	XL10	2540
1200	1375	1280	1320	30	1070	2229	180	1215	810	1870	28–30	4–27	4–35	XL16	3160
1400	1575	1480	1520	30	1230	2466	220	1215	920	1870	32–30	4–27	4–36	XL16	3770
1600	1790	1690	1730	32	1400	2778	260	1215	920	1870	40–30	/	4–36	XL16	4770
1800	1990	1890	1930	34	1550	3036	290	1420	1140	2540	44–30	/	4–39	XL25	6960
2000	2190	2090	2130	34	1750	3293	330	1420	1250	2540	48–30	/	4–42	XL25	8860
2200	2405	2295	2340	36	1870	3580	400	1420	1380	2540	52–33	/	4–42	XL40	12450
2400	2605	2495	2540	36	2050	3920	450	1620	1480	2750	56–33	/	4–42	XL40	14830
2600	2805	2695	2740	40	2180	4230	500	1620	1600	2750	60–33	/	4–42	XL40	18220
2800	3030	2910	2960	42	2350	4550	550	1620	1720	2750	64–36	/	4–42	XL40	23500
3000	3230	3110	3160	44	2500	4890	600	1890	1840	2960	68–36	/	4–42	XL63	28300
3200	3430	3310	3360	44	2650	5220	600	1890	1960	2960	72–36	/	4–42	XL63	32800

■ Model: Dx7K41H–6

DN (mm)	D	D1	D2	b	L1	L2	B	B1	H	H1	n–Φ	Z–M	n–d	Flange Standard	Weight (kg)
400	540	465	495	28	410	1190	/	960	340	1425	12–22	4–20	2–22	XL6.3	780
450	595	520	525	28	420	1240	/	960	370	1425	12–24	4–20	2–22	XL6.3	850
500	645	570	600	30	520	1312	/	960	400	1425	16–22	4–20	2–26	XL10	1050
600	755	670	705	30	565	1427	/	960	460	1425	16–26	4–24	2–26	XL10	1200
700	880	776	810	32	640	1586	/	960	540	1665	20–26	4–24	2–30	XL10	1620
800	975	880	920	34	740	1723	/	1135	580	1665	20–30	4–27	2–30	XL16	2080
900	1075	980	1020	36	820	1849	/	1135	630	1665	20–30	4–27	2–30	XL16	2350
1000	1175	1080	1120	36	900	2000	130	1215	690	1870	28–30	4–30	4–30	XL16	2680
1200	1375	1280	1320	40	1070	2265	160	1215	810	1870	28–30	4–30	4–33	XL25	3360
1400	1575	1480	1520	42	1230	2466	180	1215	920	1870	32–36	4–33	4–36	XL25	4060
1600	1790	1690	1730	46	1400	2806	220	1420	1040	2540	40–39	/	4–36	XL40	7560
1800	2000	1920	1970	50	1600	3070	260	1420	1140	2540	44–39	/	4–36	XL40	9850
2000	2265	2125	2180	54	1700	3285	290	1620	1250	2750	48–42	/	4–42	XL40	13060
2200	2475	2330	2390	60	1870	3605	330	1620	1360	2750	48–42	/	4–42	XL40	14600
2400	2685	2545	2600	60	2030	3956	385	1890	1480	2960	56–52	/	4–42	XL40	15530
2600	2905	2750	2810	64	2180	4310	440	1890	1600	2960	60–48	/	4–48	XL63	18820

Model: Dx7K41H–10

DN (mm)	D	D1	D2	b	L1	L2	B	B1	H	H1	n–Φ	Z–M	n–d	Hydraulic Station	Weight (kg)
250	395	320	350	28	/	930	/	890	/	1350	12–23	/	/	XL4	510
300	445	370	400	28	315	990	/	890	260	1350	12–23	/	2–22	XL4	550
350	505	430	460	30	340	1100	/	890	320	1350	12–23	4–30	2–18	XL4	640
400	560	482	515	32	410	1210	/	960	340	1425	12–26	4–24	2–22	XL6.3	820
450	615	532	565	32	450	1240	/	960	370	1425	13–26	4–24	2–22	XL6.3	900
500	700	585	620	34	520	1312	/	960	400	1425	16–26	4–24	2–26	XL6.3	1100
600	780	685	725	36	565	1427	/	960	460	1425	16–30	4–27	2–26	XL6.3	1300
700	895	800	810	40	640	1586	/	1135	540	1665	20–30	4–27	2–30	XL10	1800
800	1015	905	950	44	740	1723	/	1135	580	1665	20–30	4–30	2–30	XL10	2300
900	1115	1005	1050	46	820	1847	/	1135	630	1665	24–33	4–30	2–30	XL10	2600
1000	1230	1110	1160	50	900	2000	130	1215	690	1870	24–36	4–33	4–30	XL16	3080
1200	1455	1330	1380	56	1070	2265	160	1215	810	1870	28–39	4–36	4–33	XL16	3800
1400	1675	1530	1590	62	1230	2531	180	1215	920	1870	32–42	4–39	4–36	XL16	4800
1600	1915	1750	1820	68	1400	2875	220	1420	1040	2540	36–48	4–45	4–36	XL25	6920
1800	2115	1950	2020	70	1548	3155	260	1420	1140	2540	40–48	4–45	4–39	XL25	9200
2000	2325	2150	2230	74	1700	3342	290	1620	1250	2750	44–48	4–45	4–42	XL40	12200
2200	2520	2370	2440	80	1870	3660	330	1620	1360	2750	48–56	4–52	4–48	XL40	14200
2400	2760	2570	2650	82	2030	4030	385	1890	1480	2960	52–56	4–52	4–48	XL63	16200
2600	2960	2780	2870	88	2180	4410	440	1890	1600	2960	56–56	4–52	4–48	XL60	18900

Notes:

The valve flange sizes conform to GB/T 17241.6 and GB/T 9113.1 standards.
The valve structure length conforms to GB/T 12221-89 (wafer-type long structure standard).
Pressure testing follows GB/T 13927-92 standard provisions.

Specification Applications

Water Treatment Plants: To regulate water flow efficiently and avoid abrupt changes in pressure, preserving the integrity of the entire system.
Oil & Gas Industry: To control the flow of fluids, offering enhanced sealing and minimal risk of leaks under high-pressure conditions.
Chemical Processing Plants: Suitable for handling aggressive fluids, it provides reliable operation and extends the life of the valve by controlling the closure speed.
Power Stations: Ensures slow and steady valve operation to protect critical equipment from sudden pressure changes.
HVAC Systems: Offers smooth and efficient control in heating and cooling systems, preventing damage to pipes and pumps caused by sudden pressure surges.

Valve Actuation

Process Optimization

Precision Engineering

Pipeline Solutions

Industrial Valves

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Your Trusted Partner for High-Quality Valve Solutions

Storage Tank Hydraulic Slowly-Closing Check Butterfly Valve

Storage Tank Hydraulic Slowly-Closing Check Butterfly Valve

Product Overview

Product Features

◆ Working Principle

1. Routine Work

2. Oil pump pressure control:

3. Manual hand pump operation:

4. Oil tank pressure regulation:

5. Valve and pump interlock protection:

Specification Parameters

◆ Basic Parameters

◆ Special Parameters

◆ Main Components Material

◆ Main Dimensions

■ Model: Dx7K41H–6

Model: Dx7K41H–10

Specification Applications

Valve Actuation

Process Optimization

Precision Engineering

Pipeline Solutions

Industrial Valves

Flow Control

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