D37L1 LTThe T-type lug type worm gear soft seal butterfly valve is a kind of valve which uses the worm wheel type opening and closing parts to rotate back and forth about 90 ° to open, close and adjust the fluid channel.
Butterfly valve not only has the advantages of simple structure, small volume, light weight, low material consumption, small installation size, small driving torque, simple and rapid operation, but also has good flow regulation function and closing sealing characteristics at the same time. It is one of the valve products with rapid development in recent ten years. Especially in developed countries such as the United States, Japan, Germany, France and Italy, butterfly valves are widely used. The varieties and quantity of butterfly valves are still expanding, and they are developing towards high temperature, high pressure, large diameter, high sealing performance, long service life, excellent regulating characteristics and multi-function of one valve. Its reliability and other performance indexes have reached a higher level, and have partially replaced the stop valve, the valve and other performance indicators Gate and ball valves. With the progress of butterfly valve technology, butterfly valve will become the dominant valve form in a short period of time, especially in large and medium caliber, medium and low pressure applications.

The soft sealing butterfly valve is suitable for regulating flow and intercepting medium on water supply and drainage and gas pipelines of food, medicine, chemical industry, petroleum, electric power, metallurgy, urban construction, light textile, papermaking, etc
1. The design is novel and reasonable, with unique structure, light weight and quick opening and closing.
2. Small operating torque, convenient operation, labor saving and skillful.
3. It can be installed in any position and easy to maintain.
4. The sealing element can be replaced, the sealing performance is reliable, and the two-way sealing is zero leakage.
5. The sealing material has the characteristics of aging resistance, corrosion resistance and long service life.
6. It has the advantages of simple structure, good interchangeability and low price.
7. The valve stem seal is not easy to deform, so as to avoid the common phenomenon of valve stem leakage. The overall support is good, stable and firm.
8. It is easy to control the torque value in a proper range. It adopts two section valve rod without pin connection. The structure is simple and compact, and the maintenance and disassembly are very convenient.
9. The butterfly plate has the function of automatic alignment, which realizes the small interference fit between the butterfly plate and the valve seat. Phenolic back seat has the characteristics of no falling off, tensile, leak proof and convenient replacement. As the sealing surface of the valve seat is integrated with the back, the deformation of the valve seat is reduced.

D37L1Description of soft seal butterfly valve model preparation
Valve type	Transmission mode	Connection form	structural style	Sealing material	Nominal pressure	body material
D:butterfly valve	3:Worm gear	7L:Double clip single clip	1:center line	X:rubber	-10:PN1.0MPa	Z:Gray cast iron Q: Ductile iron

The sealing principle of the center line butterfly valve is to ensure that the sealing surface has the appropriate surface roughness value when the valve plate is processed, and the appropriate surface roughness value of the sealing surface is formed when the synthetic rubber seat is molded. When the valve is closed, through the rotation of the valve plate, the outer circular sealing surface of the valve plate squeezes the synthetic rubber seat, which causes the elastic deformation of the synthetic rubber seat and forms the elastic force as the sealing specific pressure to ensure the sealing of the valve.

D37L1 LTT-type lug type worm gear soft seal butterfly valve adopts standard
Design criteria	GB/T12238-2008、ISO 10631-1994 或BS EN593-1998、BS5155、MSS SP-67
Flange connection	GB/T17241.6-2008、 JIS B2212-B2214-1999,JIS B2220-2004、JIS B2210-1984、ANSI B 16.5-2009, ANSI B 16.47-2006、ISO 7005-2 或BS EN 1092-2002(PN6、PN10、PN16、 Class 125、 Class150、5K、10K、 16K)
Structural length	GB/T12221 -2005、IS0 5752-1988SBSEN558-1
Pressure test	GB/T13927-2008、JB/T9092-1999、ISO 5028-1993或BS 5755-1-1986
Top flange	Conform to is05211 and other standards

Butterfly valves are suitable for flow regulation. Since the pressure loss of butterfly valve in the pipeline is relatively large, which is about three times of that of gate valve, the influence of pressure loss on pipeline system should be fully considered when selecting butterfly valve, and the firmness of butterfly plate bearing pipeline medium pressure when closing should be considered. In addition, the working temperature limit of the elastic seat material at high temperature must be considered.
The structure length and overall height of butterfly valve are small, the opening and closing speed are fast, and the flow control characteristics are good. The structure principle of butterfly valve Zui is suitable for making large diameter valve. When butterfly valves are required to be used for flow control, it is important to select the correct size and type of butterfly valves so that they can work properly and effectively.
Generally, in throttling, regulating control and mud medium, short structure length and fast opening and closing speed (1 / 4 turn) are required. Low pressure cut-off (small pressure difference), butterfly valve is recommended.
Butterfly valve can be used when double position adjustment, necking channel, low noise, cavitation and gasification phenomenon, a small amount of leakage to the atmosphere and abrasive medium.
When using butterfly valve under special working conditions, such as throttling adjustment, strict sealing, severe wear and low temperature (cryogenic), special butterfly valve with specially designed metal sealing belt regulating device shall be used.
The middle line butterfly valve is suitable for fresh water, sewage, sea water, salt water, steam, natural gas, food, medicine, oil products, acid storage and other pipelines that require complete sealing, zero gas test leakage, high life requirements and working temperature of - 10 ~ 150 ℃.
Soft seal eccentric butterfly valve is suitable for bidirectional opening and closing and regulating of ventilation and dust removal pipeline, and is widely used in gas pipeline and water channel of metallurgy, light industry, electric power and petrochemical system.
Metal to metal wire sealed double eccentric butterfly valve is suitable for urban heat supply, steam supply, water supply, gas, oil, acid and alkali pipelines as regulating and intercepting devices.
In addition to being used as program control valve of large PSA gas separation unit, metal to metal seal triple eccentric butterfly valve can also be widely used in petroleum, petrochemical, chemical, metallurgy, electric power and other fields. It is a good substitute for gate valve and stop valve.

Nominal diameter
Nominal diameter	external diameter D	Center distance D1	Number and diameter of bolt holes ZxMφ	Long structure L	Total height H	Base height H1	Handle length A	Disc width B
40	150	110	4xM16	43	306	68	160	125
50	165	125	4xM16	43	306	68	160	125
65	185	145	4xM16	46	321	75	160	125
80	200	160	8xM16	46	346	85	160	125
100	220	180	8xM16	52	386	105	160	125
125	250	210	8xM16	56	411	120	160	125
150	285	240	8xM20	56	446	135	160	125
200	340	295	8xM20	60	570	165	210	165
250	395	350	12xM20	68	646	206	210	165
300	445	400	12xM20	78	738	230	210	175
350	505	460	16xM20	78	761	248	210	175
400	565	515	16xM24	88	877	289	270	440
450	615	565	20xM24	108	938	320	270	440
500	670	620	20xM24	127	993	343	270	440
600	780	725	20xM27	154	1131	413	300	535

 

(1) Because the pressure loss of butterfly valve is larger than that of gate valve and ball valve, it is suitable for pipeline system with less pressure loss requirements.
(2) Since butterfly valve can be used for flow regulation, it is suitable to be selected in the pipeline that needs flow adjustment.
(3) Due to the limitation of structure and sealing material of butterfly valve, it is not suitable for high temperature and high pressure pipeline system. The general working temperature is below 300 ℃ and the nominal pressure is below PN40.
(4) As the butterfly valve structure length is relatively short, and can be made into a large diameter, so in the case of short structure length or large diameter valve (such as more than DN 1000), butterfly valve should be selected.
(5) Since the butterfly valve can be opened or closed only by rotation, it is suitable to select butterfly valve in the field with fast opening and closing requirements.

1. Before installation, check whether the specification, pressure, temperature and corrosion resistance of butterfly valve meet the use requirements. Check whether the parts are damaged or loose.
2. The butterfly valve can be installed on the pipeline at any angle and should be closed; when welding the pipe flange, the valve sealing port should be blocked with a plate to prevent particles and sundries from damaging the sealing surface. After welding, take down the valve, clean the valve sealing surface and pipe cavity, and then install the fixed valve.
3. Please pay attention to the pressure bearing direction when the valve is closed.
4. Before installation, the sealing surface (sealing surface at both ends, sealing surface of butterfly plate and sealing surface of valve seat) shall be thoroughly cleaned to remove dust and dirt.
5. Before installation, the butterfly valve should be air tested, and the opening and closing position should be flexible, and the opening and closing position should be consistent with the position indicated by the pointer.
6. Manual operation, clockwise is off, counter clockwise is on, pointer indication is in place, it is not allowed to open and close the valve with additional force.
7. During the pressure test of the valve, it is not allowed to use single flange for installation and pressure test, but double flange installation and pressure test must be adopted. The test pressure shall comply with GB / T13927-92.
8. The bolts shall be tightened symmetrically and alternately instead of separately.
9. The limit screw has been adjusted before delivery, so it is not allowed to adjust it easily. If the configuration of driving device is electric or pneumatic, please refer to the manual of supporting drive device.
10. When the electric butterfly valve leaves the factory, the opening and closing stroke of the control mechanism has been adjusted. In order to prevent the wrong direction when the power supply is connected, the user should first manually open it to the half open position before connecting the power for the first time, and then press the inching switch to check that the direction of the indicator wheel is consistent with the opening direction of the valve.
11. If the valve is found to be open and closed abnormally, the cause shall be found out for repair and elimination, so as to prevent the valve from being damaged due to opening and closing by means of applying force.
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