Electric Regulating Butterfly Valve_Meisonilan Valves (Suzhou) Co., Ltd.

1. The U-shaped elastic sealing ring metal hard sealing structure has almost no wear on the valve seat and butterfly plate, and has a sealing function that becomes tighter and tighter as viewed.
2. The sealing ring is made of stainless steel, which has the dual advantages of metal hard sealing and elastic sealing. It has excellent sealing performance in both low and high temperatures, corrosion resistance, and long service life.
3. The sealing surface of the disc plate is made of welded cobalt based hard alloy, which is wear-resistant and has a long service life.
4. The large-sized butterfly plate adopts a frame structure with high strength, large overcurrent area, and low flow resistance.
5. This valve has a bidirectional sealing function, which is not limited by the flow direction of the medium or the spatial position during installation, and can be installed in any direction.

Main Technical Parameters

Nominal Diameter DN (mm)	50 - 2000
Nominal Pressure PN (MPa)	0.6	1.0	1.6	2.5
Sealing Test (MPa)	0.66	1.1	1.76	2.75
Strength Test (MPa)	0.9	1.5	2.4	3.75
Applicable Temperature	Carbon Steel: -29°C - 425°C; Stainless Steel: -40°C - 650°C
Applicable Medium	Water, Air, Natural Gas, Oil and Weakly Corrosive Fluids
Leakage Rate	Complies with GB/T13927 - 92 Standard
Drive Mode	Worm Gear Drive, Electric, Pneumatic, Hydraulic

Main Component Materials

Part Name	Material
Valve Body	WCB, Alloy Steel, Stainless Steel, QT450 - 10
Butterfly Plate	WCB, Alloy Steel, Stainless Steel, QT450 - 10
Valve Shaft	2Cr13 Stainless Steel, Alloy Steel
Sealing Ring	Stainless Steel Ring
Packing	Flexible Graphite

Adopted Standards

Manufacturing Standard	JB/T 8527 - 97
Flange Standard	GB9113 - 2000
Structural Length Standard	GB12221 - 89
Inspection Standard	GB/T 13927 - 92

Main External Connection Dimensions (Unit: mm)

Nominal Diameter (DN)	Main Dimensions			Flange Dimensions and Bolt Specifications
	Main Dimensions			1.0MPa			1.6MPa			2.5MPa
	L	H1	H	D	D1	n - Фd	D	D1	n - Фd	D	D1	n - Фd
50	108	350	112	165	125	4 - 18	165	125	4 - 18	165	125	4 - 18
65	112	370	115	185	145	4 - 18	185	145	4 - 18	185	145	8 - 18
80	114	380	120	200	160	4 - 18	200	160	8 - 18	200	160	8 - 18
100	127	420	138	220	180	8 - 18	220	180	8 - 18	235	190	8 - 22
125	140	460	164	250	210	8 - 18	250	210	8 - 22	270	220	8 - 26
150	140	555	175	285	240	8 - 22	285	240	8 - 22	300	250	8 - 26
200	152	760	200	340	295	8 - 22	340	295	12 - 22	360	310	12 - 26
250	165	830	243	395	350	12 - 22	405	355	12 - 26	425	370	12 - 30
300	178	895	250	445	400	12 - 22	460	410	12 - 26	485	430	16 - 30
350	190	950	280	505	460	16 - 22	520	470	16 - 26	555	490	16 - 33
400	216	1190	305	565	515	16 - 26	580	525	16 - 30	620	550	16 - 36
450	222	1255	350	615	565	20 - 26	640	585	20 - 30	670	600	20 - 36
500	229	1305	380	670	620	20 - 26	715	650	20 - 33	730	660	20 - 36
600	267	1340	445	780	725	20 - 30	840	770	20 - 36	845	770	20 - 39
700	292	1520	480	895	840	24 - 30	910	840	24 - 36	960	875	24 - 42
800	318	1710	530	1015	950	24 - 33	1025	950	24 - 39	1085	990	24 - 48
900	330	1810	580	1115	1050	28 - 33	1125	1050	28 - 39	1185	1090	28 - 48
1000	410	1960	650	1230	1160	28 - 36	1255	1170	28 - 42	1320	1210	28 - 56
1200	470	2250	760	1455	1380	32 - 39	1485	1390	32 - 48	1530	1420	32 - 56
1400	530	2435	850	1675	1590	36 - 42	1685	1590	36 - 48	1755	1640	36 - 62
1600	600	2780	1030	1915	1820	40 - 48	1930	1820	40 - 56	1975	1860	40 - 62
1800	670	3020	1230	2115	2020	44 - 48	2130	2020	44 - 56	2195	2070	44 - 70
2000	760	3270	1350	2325	2230	48 - 48	2345	2230	48 - 62	2425	2300	48 -

Valve Installation:
(1) Before installation, check that the product model, tag number, and specifications match the requirements. Inspect the entire valve for missing or loose parts.
(2) Prior to installation, clean the pipeline. Ensure there is sufficient straight pipe section at the valve inlet and install a filter. When connecting the valve body to the pipeline flanges, ensure coaxiality.
(3) Thoroughly clean the pipeline before installing the valve.
(4) The installation site should ensure the safety of personnel and equipment, facilitating operation, disassembly, and maintenance.
(5) The valve should be installed vertically upright on horizontal pipelines. If necessary, it can be installed at an angle, but horizontal installation should be avoided. For occasions with heavy valve weight or vibration, use a support frame.
(6) The medium flow direction must align with the arrow on the valve body. The air supply should be dry and oil-free. The valve should be used in environments with temperatures ranging from -20℃ to 55℃.

Valve Maintenance:
(1) Cleaning the Valve: For general media, cleaning with water is sufficient. For media harmful to health, first understand their properties and then select an appropriate cleaning method.
(2) Disassembly: Remove rust from exposed rusted parts first. Before derusting, protect the machined surfaces of precision parts such as the valve seat, valve plug, valve stem, and push rod. Use special tools when disassembling the valve seat.
(3) Valve Seat: Minor rust or wear on the sealing surface can be repaired by machining. If damage is severe, replace the seat. However, both repaired and replaced hard sealing surfaces must be lapped.
(4) Valve Stem: If the surface is damaged, it must be replaced.
(5) Damage to Push Rod, Guide, and Sealing Surfaces: Reverse-acting actuators must be replaced; direct-acting actuators can be reused after proper repair.
(6) Compression Spring: If there are cracks or other defects affecting strength, replace it immediately.
(7) Wear Parts: Packing, gaskets, and O-rings must be replaced entirely during each maintenance. Check the valve plug and diaphragm for cracks, aging, or corrosion that may cause future failures. Decide whether to replace them based on inspection results, but the diaphragm service life should not exceed 2-3 years.
(8) When reassembling the valve, ensure alignment. Tighten bolts diagonally and lubricate sliding parts. After reassembly, debug the valve according to the factory test items and methods. During this period, accurately adjust the packing compression force and the valve plug closing position.

When placing an order, please fill in the Specification Sheet or specify the following information:

If the model has not been selected before ordering, please provide us with the operating parameters:
(1) Nominal diameter DN (mm);
(2) Nominal pressure (MPa or bar);
(3) Fluid properties (including medium temperature, viscosity, or acidity/alkalinity);
(4) Pressure before and after the valve (pressure differential);
(5) Requirements for flow characteristics;
(6) Materials of valve body and valve core;
(7) Connection type;
(8) Driving method (provide air supply pressure, driving voltage);
(9) Supporting accessories (for pneumatic valves, it is recommended that users install an air filter triplet and a 2-position 5-way solenoid valve);
(10) On-site working conditions.
If the product model of our company has been selected by the design unit, please order directly from our production department according to the model;
When the application occasion is very important or the pipeline is relatively complex, please provide the design drawings and detailed parameters as much as possible, and our experts will review and check them for you.