Expansion valve

An expansion valve for a refrigerant cycle, comprising:

• a main body block having a high pressure passage portion, a low pressure passage portion and a communication passage portion between the high pressure passage portion and the low pressure passage portion;
• a valve element disposed in the communication passage portion so that an orifice passage is defined for decompressing and expanding a high pressure refrigerant, which flows from the high pressure passage portion, into a low pressure refrigerant and for controlling a flow rate of the low pressure refrigerant flowing into the low pressure passage portion in accordance with an opening degree of the orifice passage;
• a spring member disposed in the communication passage portion for applying a biasing force to the valve element;
• and
• a deformation portion disposed on a side opposite to the valve element with respect to the spring member to define an end of the communication passage portion, wherein
• the spring member is disposed between the valve element and the deformation portion and a set value of the spring member is adjusted by deforming the deformation portion by a predetermined amount in a direction parallel to an expansion and contraction direction of the spring member.