Gate valve capable of being opened and closed by using elastic force

A gate valve comprising:

• a valve body having a chamber, a positioning plate, and two valve openings communicating with the chamber and located between the chamber and the positioning plate;
• and
• a gate unit including a transmission base disposed in the valve body and reciprocally moved between a first position and a second position relative to the valve body, at least one elastic member mounted to the transmission base and having an elastic positioning portion protruding out of the transmission base, and two gate plates disposed at two opposite sides of the transmission base and connected together through the elastic member, such that the gate plates are moved towards each other by an elastic force of the elastic member, wherein when the transmission base is located at the first position, the gate plates and the elastic member are received in the chamber of the valve body for allowing the valve openings of the valve body to be opened, and when the transmission base is located at the second position, the valve openings of the valve body are sealed by the gate plates, and the elastic positioning portion of the elastic member is abutted against the positioning plate of the valve body,
• wherein the gate unit includes at least two of said elastic members each having two opposite elastic portions;
• one ends of the elastic portions of each of the elastic members are connected with the gate plates and the other ends of the elastic portions of each of the elastic members are connected with the elastic positioning portion;
• lengths of the elastic portions of one elastic member are greater than lengths of the elastic portions of the other elastic member.

A gate valve comprising:

• a valve body having a chamber, a positioning plate, and two valve openings communicating with the chamber and located between the chamber and the positioning plate;
• and
• a gate unit including a transmission base disposed in the valve body and reciprocally moved between a first position and a second position relative to the valve body, at least one elastic member mounted to the transmission base and having an elastic positioning portion protruding out of the transmission base, and two gate plates disposed at two opposite sides of the transmission base and connected together through the elastic member, such that the gate plates are moved towards each other by an elastic force of the elastic member, wherein when the transmission base is located at the first position, the gate plates and the elastic member are received in the chamber of the valve body for allowing the valve openings of the valve body to be opened, and when the transmission base is located at the second position, the valve openings of the valve body are sealed by the gate plates, and the elastic positioning portion of the elastic member is abutted against the positioning plate of the valve body,
• wherein the gate unit further includes two balls disposed at two opposite sides of the transmission base;
• each of the gate plates has a rolling groove at one side towards the transmission base;
• the rolling grooves each have a first section and a second section connected with the first section;
• a depth of the first section is greater than a depth of the second section;
• when the transmission base is located at the first position, the balls are located at the first sections of the rolling grooves, and when the transmission base is located at the second position, the balls are located at the second sections of the rolling grooves and push the gate plates outwards to seal the valve openings.