1. Small in size and light in weight, easy instillation and maintenance. It can be mounted wherever needed 2. Simple and compact construction, quick 90 degrees on-off operation 3. Minimized operating torque, energy saving 4. Flow curve teeing to straight line, excellent regulation performance 5. Long service life, standing the test of tens of thousands opening/closing operations 6. Bubbles-tight sealing with no leakage under the pressure test 7. Wide selection of materials, applicable to various mediums Material of main parts: Body: cast iron, ductile iron, stainless steel, cast steel (WCB) Disc: Monel, ductile iron, stainless steel, Al-bronze, ductile iron with nylon coated Seat: EPDM or NBR or PTFE or VITON or vulcanized in body Stem: SS416 or SS316 or Monel Pin: SS316 or Monel Operated: handle or wormgear, ;