SD341XExpansion flange butterfly valve is used in petroleum, metallurgy, chemical industry, electric power, medicine, food, light textile, ship, municipal engineering and water supply and drainage system. It is suitable for the general corrosive, non corrosive gas, liquid, semi fluid, solid powder and other media for closure and regulation control. It can also be used for the transformation of old pipelines, maintenance and replacement of matching valves.

Nominal pressure PN(Mpa)	Test pressureMPa		working pressure MPa	working temperature   （℃）
	seal up	strength
1.0(10)	1.1	1.5	1.0	-46℃-135℃

SD341XThe expansion flange butterfly valve is a flange connection. Its main feature is that the structure length can be expanded and extended, which is conducive to be installed on the long pipe to absorb the heat expansion and cold contraction or balance the vibration influence of the pipeline. Because of the long expansion space, the expansion device is omitted. The valve adopts rubber soft seal with good sealing performance, and has the characteristics of simple structure, light weight, short connection size, large flow rate, small liquid resistance and convenient maintenance.
The main parts of the valve are valve body, expansion pipe, butterfly plate, sealing ring, valve stem and actuator. When using, rotate the hand wheel clockwise to close and counterclockwise to open.

Part name	Material Science	Part name	Material Science
valve body	Cast iron / cast steel	Sealing ring pressing plate	Q235
Telescopic tube	Cast iron / cast steel	Stem	2Cr13,  45
Disc	Cast iron / cast steel	seal ring	Oil resistant rubber

SD341X-10、SD941X-10  Main dimensions：

Specifications	minimum  L1	middle  L	Longest  L2	D	D1	D2	H1	H2	Z-φd
100	174	195	216	215	180	155	110	170	8-φ18
125	186	209	232	245	210	185	123	185	8-φ18
150	194	216	239	280	240	210	140	210	8-φ23
200	214	239	264	335	295	265	170	238	8-φ23
250	260	276	296	390	350	320	195	270	12-φ23
300	250	275	300	440	400	368	222	300	12-φ23
350	270	295	320	500	460	428	252	330	16-φ23
400	280	307	330	565	515	482	285	368	16-φ25
450	305	330	355	615	565	532	310	402	20-φ25
500	315	340	365	670	620	585	337	438	20-φ25
600	370	395	420	780	725	685	393	490	20-φ30
700	396	421	446	895	840	800	450	558	24-φ30
800	426	451	476	1010	950	905	515	625	24-φ34
900	456	481	506	1110	1050	1005	560	685	28-φ34
1000	466	491	516	1220	1160	1115	610	750	28-φ34
1200	510	535	560	1450	1380	1325	725	880	32-φ41
1400	540	565	590	1675	1590	1525	840	987	36-φ48
1600	585	608	630	1915	1820	1750	960	1158	40-φ54
1800	630	655	680	2115	2020	1950	1060	1258	44-φ54
2000	680	705	730	2325	2230	2160	1165	1365	48-φ54

1. The valve is not allowed to be smashed in the process of transportation, so as to avoid damaging the sealing surface.
   The valve should be stored in a cool and dry place for a long time. The valve plate should be opened at 5 ° to 10 ° state. Both ends should be blocked and covered. If there is a packing box, the valve can be placed overlapped.
   The following work should be done before valve installation
   Wipe off the dirt attached on the valve;
   Check whether the working condition is consistent with the valve working pressure, working temperature and corrosion resistance;
   Check whether the parts of the valve are loose or damaged;
   The manual opening and closing of the valve shall be flexible and free of jamming;
   This kind of valve is allowed to be installed in any position, angle and open air. If there is no special description in the order contract, the electric valve can only be installed vertically and indoors.
   The valve can be driven by worm gear, or electrically, pneumatically, hydraulically or electrically, pneumatically and hydraulically. When the valve points to 0 ° or 90 ° it indicates that the opening and closing is completed. It is not allowed to open and close the valve forcibly to avoid damaging the machine parts. The two limit screws on the worm gear box have been adjusted before delivery, and they are generally not allowed to be adjusted during use. If necessary, the limit screws should be locked after adjustment.
   After the valve is installed, the user can make the maintenance cycle according to the opening and closing frequency, and fill the actuator with lubricating grease according to the cycle.
   In case of abnormal opening and closing of the valve, the cause should be found out and eliminated. It is not allowed to use knocking method to force opening and closing.
   The valve should be installed according to the nominal length (middle length), not two limit lengths.
   When the valve is installed in the pipeline, the valve seat should be coaxial with the pipe, and appropriate gasket should be clamped between the flange at both ends and the valve body flange.
   10. The valve should not be installed at the corner or the end of the pipe. When the valve is installed in the middle of the pipeline, the pipeline at both ends of the valve must be fixed and the limit is firm.
   11. When the performance test of the valve needs to be carried out on site, it should be carried out according to the provisions of GB / T13927-92. The sealing test includes valve sealing test and expansion part sealing test. In the sealing test of expansion part, the butterfly plate should be closed, and the expansion pipe should be covered tightly with a blind plate which can be injected with medium and connected with the valve itself Bolts shall be used to limit to a certain position, and the maximum position shall not exceed the limit length.
   12. The flange sealing surfaces on both sides of the pipeline must be parallel.
   13. When tightening the flange bolts, they should be tightened symmetrically and alternately, and should not be tightened separately according to the times.

Possible faults	Cause	resolvent
Packing leakage	Packing not compacted Insufficient number of packing rings Insufficient number of packing rings	Tighten the packing gland nuts evenly and compress the packing Add filler Replacement of packing
Leakage at the joint of valve body and nozzle	The connecting bolts and nuts are not tightened or tightened unevenly Damage or dirt on sealing surface of nozzle Damage or failure of O-ring	Tighten evenly and crosswise Repair the sealing surface or clean up the dirt Replace the O-ring
Leakage of sealing surface	1.There are impurities on the sealing surface 2.Wear of sealing ring 3.The pressing plate is loose	Remove debris Replace the sealing ring Tighten the adjusting screws of Part 8 evenly and properly
Replacement of packing	The packing pressure is too tight, or the packing gland is skewed Transmission parts damaged The seal ring is aged and creeps	Adjust the nuts on the packing gland Replace parts Replace the sealing ring

用户If there are special requirements, it should be stated at the time of ordering. Our factory can design and produce again according to the user's requirements.