Bosch Rexroth makes pilot-to-open style load-holding valve sleeves. Flow is always allowed to pass from A to B when pressure at A rises above the spring bias pressure and the poppet is pushed from the seat. The valve is normally closed (checked) from B to A; when sufficient pilot pressure is present at Pil port (X), the annular pilot area pushes the poppet from its seat and flow is allowed from B to A. The -pilot-to-open load-holding valve is available in different sizes and versions for different flow ranges.