Expansion valve

A thermal expansion valve comprising:

• a valve body;
• a power element portion mounted on the valve body;
• a diaphragm forming one sealed chamber defined inside said power element portion and another sealed chamber;
• and
• a rod member for controlling the opening degree of the valve by a displacement of said diaphragm occurring by the pressure difference of said sealed chambers;
• wherein said rod member controls the flow rate of the refrigerant by the opening of said valve, further wherein an X-ring is mounted on said rod member.

A thermal expansion valve comprising:

• a valve body comprising a first path where a liquid-phase refrigerant passes toward an evaporator and a second path where a gas-phase refrigerant passes from the evaporator to a compressor;
• an orifice mounted inside said first path;
• a valve which controls the amount of refrigerant passing said orifice;
• a power element portion mounted on said valve body having a diaphragm to be displaced by sensing the temperature of said gas-phase refrigerant;
• and
• a rod member working as a heat sensing shaft for driving said valve by the displacement of said diaphragm;
• wherein said rod member is mounted slidably inside a through hole connecting said first path and said second path, and an X-ring is equipped between said rod member and said through hole.

A thermal expansion valve comprising:

• a valve;
• a high pressure path and a low pressure path mounted on said valve body for flowing a refrigerant;
• an orifice mounted perpendicular to said low pressure path for connecting said high pressure path and said low pressure path and having a valve opening connected to said low pressure path;
• said valve contacting and parting from said valve opening;
• and
• a rod member mounted through said orifice for contacting and parting said valve against the valve opening;
• wherein said rod member further comprises an X-ring formed between said valve body.