To add another option, I think it's more idiomatic Latin to use the verb constāre directly.

Valōrem meum constat.
My value is constant.

(Or, equivalently, "my value remains fixed" or "my value doesn't change".)

To add another option, I think it's more idiomatic Latin to use the verb constāre directly.

Valor meus constat.
My value is constant.

(Or, equivalently, "my value remains fixed" or "my value doesn't change".)