Valve system for drilling systems

A valve block assembly, comprising:

• a valve block having a first outlet and a second outlet, said first outlet being configured to be coupled to a piston side of a feed cylinder and said second outlet being configured to be coupled to a ring side of the feed cylinder;
• a load holding valve housed in said valve block and operatively associated with said first outlet;
• a feed balancing valve housed in said valve block, said feed balancing valve being in fluid communication with said load holding valve;
• and
• a fast feed differential valve housed in said valve block, said fast feed differential valve being configured to switch from a disengaged state to an engaged state, wherein in said engaged state said fast feed differential valve directs fluid from said second outlet to said first outlet.

A valve block assembly, comprising:

• a valve block having a first outlet and a second outlet, said first outlet being configured to be coupled to a piston side of a feed cylinder and said second outlet being configured to be coupled to a ring side of the feed cylinder;
• a load holding valve housed in said valve block and operatively associated with said first outlet;
• a feed balancing valve housed in said valve block;
• a fast feed differential valve housed in said valve block;
• a first inlet defined in said valve block, said first inlet being in communication with said feed balancing valve,
• a second inlet defined in said valve block, said second inlet being in communication with a first node;
• and
• a third inlet defined in said valve block, said third inlet being in communication with said first node, wherein said first node is in communication with said fast feed differential valve and said valve holding block, wherein fluid directed from said first inlet to said first node or said second inlet to said first node acts to establish a fluid pathway between said first outlet and said feed balancing valve.

A valve system for use in a drilling system, comprising:

• a load holding valve;
• a feed balancing valve in fluid communication with said load holding valve;
• a feed balancing pilot control in communication with said feed balancing valve, said feed balancing pilot control being configured to control pressure in a fluid pathway between said load holding valve and said feed balancing valve;
• a fast feed differential valve;
• and
• a fast feed pilot control in communication with said fast feed differential valve, said fast feed pilot control being configured to move said fast move said fast feed differential valve between an engaged state and a non-engaged state, wherein in said non-engaged state said fast feed differential valve is configured route fluid to a tank and in an engaged state said fast feed differential valve is configured to route the fluid from a ring side of a feed cylinder to a piston side of the feed cylinder.