Sealability-enhanced soft seat plate type gate valve

A soft seat knife plate type valve comprising:

• a valve main body;
• a packing removably coupled to the valve main body;
• and
• an opening and closing plate configured to be inserted into the packing,
• wherein the opening and closing plate and the packing are operatively coupled to each other,
• wherein the packing comprises a first packing and a second packing, and the first packing and the second packing are configured to form a space to allow the opening and closing plate to be inserted thereinto,
• wherein the opening and closing plate and the packing are structured, such that an edge portion of the opening and closing plate is inserted into the space, first, when the opening and closing plate is inserted into the packing,
• wherein a first sealing structure is formed on the packing,
• wherein a second sealing structure is formed on the edge portion of the opening and closing plate,
• wherein the first sealing structure has a protruding semicircular shape and the second sealing structure has a recessed triangular shape, and
• wherein, when the opening and closing plate is inserted into the packing, the protruding semicircular shape of the first sealing structure and the recessed triangular shape of the second sealing structure are in contact with each other.