Features

• Unique valve stem flexible sealing
• Structure of valve stem nut holding down butterfly spring leaf and then packing is adopted to ensure the sealing and the valve without leakage outside by making the packing remain enough pressing force after abrasion.
• Anti-extrusion and invented sealing
• Valve stem is of down installation type and inverted sealing structure with sealing washer. Sealing strength of inverted sealing increases as the pressure of the media in the valve pressure chamber goes up to ensure the sealing and avoid the extrision of valve stem.