Pressure regulator for fuel cell system

A pressure regulator for a fuel cell system, comprising:

• a housing including:
• an inlet port into which gas is introduced,
• an outlet port through which the gas is discharged, and
• an regulated pressure chamber connected to an outside through the outlet port;
• a piston moving up and down in the housing, and including:
• a main flow path penetrating through an inside of the housing, and
• a pressure acting portion applying a pressure of gas in the regulated pressure chamber of the housing, and selectively communicating between the inlet port and the regulated pressure chamber of the housing through the main flow path as the piston moves up and down;
• a spring provided outside of the housing and configured to elastically support the pressure acting portion of the piston on an opposite side of the regulated pressure chamber, and
• pillars elastically provided by the spring and coupled to the pressure acting portion of the piston, the pillars configured to transmit a force between the spring and the pressure acting portion of the piston,
• wherein:
• the pillars penetrate through the housing in a state in which the pillars are elastically supported by the spring to be coupled to the pressure acting portion of the piston;
• and
• the housing is provided with a plurality of through holes disposed along a circumferential direction, and each of the inserted pillars is interposed between a spring seat and the pressure acting portion of the piston in a state in which each pillar is inserted into each through hole of the plurality of through holes.