Scroll compressor with condition responsive back pressure chamber valve

A scroll compressor comprising:

• a first scroll member having a base and a generally spiral wrap extending from its base;
• a second scroll member having a base and a generally spiral wrap extending from its base, said wraps of said first and second scroll members interfitting to define compression chambers;
• said second scroll member being driven to orbit relative to said first scroll member to entrapped refrigerant in said compression chambers to become compressed;
• and
• a pair of taps extending through one of said first and second scroll members to deliver a refrigerant into a back pressure chamber defined behind a base of one of said first and second scroll members, a first of said tap communicating with a lower pressure compression chamber, and a second of said taps communicating with the higher pressure compression chamber, a condition responsive valve selectively opening or closing said second tap, and said condition responsive valve being movable upon an elevated temperature being reached within said compressor to open said second tap.