D343h worm gear metal hard seal butterfly valve PN10 ～ PN40 adopts precision J-shaped elastic sealing ring and three eccentric multi-level metal hard sealing structure. It is widely used in gold treatment, electric power, petrochemical industry, water supply and drainage and municipal construction and other industrial pipelines with medium temperature ≤ 425 ℃ for regulating flow and carrying off fluid.

 

1. The closer the butterfly valve seat is, the harder it is to seal the valve seat;
2. The sealing surface of butterfly plate adopts hardfacing cobalt based cemented carbide, which is wear-resistant and has long service life;
3. The seal ring is made of stainless steel, which has the double advantages of metal hard seal and elastic seal. It has excellent sealing performance, corrosion resistance and long service life under low and high temperature conditions;
4. Large size butterfly plate adopts quilting frame structure with high strength, large flow area and small flow resistance;
5. The metal hard seal butterfly valve has the function of two-way sealing. It is not limited by the flow direction of medium or affected by the space position. It can be installed in any direction;
6. The driving device can be installed in multiple positions (rotating 90 ° or 180 ° for users' convenience);

 

 

1. Design code: GB / T 12238; 2. Structural length: GB / T 12221; 3. Flange connection: GB / T 9113; 4. Test and inspection: GB / T 13927; 5. Product identification: GB / T 12220;

D343h-40 worm gear metal hard seal butterfly valve external structure connection dimension (mm) nominal diameter structure length
(standard value) overall dimension (reference value) connection dimension (standard value) lhdt343hdt643hdt943hpn4.0mpa mm inch short h1a1b1h2a2b2h3a3b3dd1z-d502108150112350180200


5302502551651254-18652 1/2112170115370180200625355925502502551851458-18803114180120380180200625355925652502552001608-181004127190138420180200645355926002502552351908-2212551402001644601802006755501386402502552702208-2615061402101755552702807155501387053003153002508-26200815223020860527028080055013877530031537532012-302501016525024368027028085055013894530031545038512-3330012178270283800380420925450220107030031551545016-33350141902903108303804201035450220114030031558051016-3640062163103509154504701070650280121030031566058516-3945082223303809604804901190650280133557571468561020-39500202293504101020480490


141557571475567020-42

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.