1.Non-rising handwheel,rising stem.

2. A strong clamping piece ensure the stem is no rotation during operating.

3.Packing seal,as a second seal,can keep no leakage from stem when bellows is damaged.

4. Bellows are connected with flat ends and decrease the risk of weld cracking caused by 

    medium pressure fluctuations.

5.  Back sealing design can accurately control the operating stroke and prevent bellows broken

 caused by misoperation.

6.  Extended bonnet guarantee the bellows with reasonable corrugations have enough 
    space.  All bellows hide in  the valve cover, can protect the bellows to avoide the 
    directly ersion from medium.

7. Longer bellows is separated into several segments, and the welding piece is guided

   by stem, this design can increase the rigidity of bellows and prevent the bellows 
   touching with stem or cover.

8.  Bottom welding piece of bellows is guided by inner hole of cover, this increase 
   the stem rigidity and advantageous to the sealing.
9.  According to EN13709,the bigger size valve is with balance disc.

10. The valve can be designed with guiding disc, so the valve can used at vertical
  installation. 
  If you want to regulate the medium flow,you can control the opening areas of 
  guidance rib.