Slurry valve clutch mechanism

A slurry valve comprising a valve body having an inlet and an outlet, one of which has a valve seat for seating a valve closure member carried on a valve stem;

• a drive member threadably engaged with the valve stem and rotatable relative to the valve stem to axially move the valve stem and closure member relative to the valve seat to open and close the inlet or outlet;
• a driving means for rotating the drive member;
• a clutch mechanism having a clutch body with an internally threaded bore for threadably receiving the valve stem;
• and
• clamping means actuable with the clutch body for clamping the clutch body to the driving means so as to lock the valve stem and drive member together and allow them to rotate in unison to grind scale from the valve seat and closure member when they are positioned against each other;
• wherein when the valve stem and drive member are locked together, all further rotation of the valve stem handle rotates the valve closure member against the valve seat without lifting away from the valve seat and without closing against the valve seat.

A clutch mechanism for a slurry valve, wherein the slurry valve has a valve seat for seating a valve closure member carried on a valve stem, a drive member threadably engaged with the valve stem, the drive member being rotatable relative to the valve stem to axially move the valve stem and closure member relative to the valve seat to open and close the slurry valve, and a driving means for rotating the drive member, the clutch mechanism comprising:

• a clutch body having an internally threaded bore for threadably receiving the valve stem;
• and
• clamping means actuable with the clutch body for clamping the clutch body to the driving means so as to lock the valve stem and drive member together and allow them to rotate in unison to grind scale from the valve seat and valve closure member when they are positioned against each other;
• wherein the clamping means is fasteners positioned in a pair of apertures in the clutch body located on diametrically opposite sides of the bore.

A clutch mechanism for a slurry valve, wherein the slurry valve has a valve seat for seating a valve closure member carried on a valve stem, a drive member threadably engaged with the valve stem, the drive member being rotatable relative to the valve stem to axially move the valve stem and closure member relative to the valve seat to open and close the slurry valve, and a driving means for rotating the drive member, the clutch mechanism comprising:

• a clutch body having an internally threaded bore for threadably receiving the valve stem;
• and
• clamping means actuable with the clutch body for clamping the clutch body to the driving means so as to lock the valve stem and drive member together and allow them to rotate in unison to grind scale from the valve seat and valve closure member when they are positioned against each other;
• wherein the clamping means is an annular wheel located around the periphery of the clutch body and engages with the clutch body by a fine external thread.

A clutch mechanism for a slurry valve, wherein the slurry valve has a valve seat for seating a valve closure member carried on a valve stem, a drive member threadably engaged with the valve stem, the drive member being rotatable relative to the valve stem to axially move the valve stem and closure member relative to the valve seat to open and close the slurry valve, and a driving means for rotating the drive member, the clutch mechanism comprising:

• a clutch body having an internally threaded bore for threadably receiving the valve stem;
• and
• clamping means actuable with the clutch body for clamping the clutch body to the driving means so as to lock the valve stem and drive member together and allow them to rotate in unison to grind scale from the valve seat and valve closure member when they are positioned against each other;
• wherein the clamping means is a pneumatic or hydraulic cylinder that produces a longitudinal force on the clutch body relative to the driving means.

A slurry valve comprising a valve body having an inlet and an outlet, one of which has a valve seat for seating a valve closure member carried on a valve stem;

• a drive member threadably engaged with the valve stem and rotatable relative to the valve stem to axially move the valve stem and closure member relative to the valve seat to open and close the inlet or outlet;
• a driving means for rotating the drive member;
• a clutch mechanism having a clutch body with an internally threaded bore for threadably receiving the valve stem;
• andclamping means actuable with the clutch body for clamping the clutch body to the driving means so as to lock the valve stem and drive member together and allow them to rotate in unison to grind scale from the valve seat and closure member when they are positioned against each other;
• wherein the fasteners positioned in apertures located on diametrically opposite sides of the bore, the fasteners being received in recesses in the driving means.

A slurry valve comprising a valve body having an inlet and an outlet, one of which has a valve seat for seating a valve closure member carried on a valve stem;

• a drive member threadably engaged with the valve stem and rotatable relative to the valve stem to axially move the valve stem and closure member relative to the valve seat to open and close the inlet or outlet;
• a driving means for rotating the drive member;
• a clutch mechanism having a clutch body with an internally threaded bore for threadably receiving the valve stem;
• and
• clamping means actuable with the clutch body for clamping the clutch body to the driving means so as to lock the valve stem and drive member together and allow them to rotate in unison to grind scale from the valve seat and closure member when they are positioned against each other;
• wherein the clamping means is an annular wheel located around the periphery of the clutch body and engages with the clutch body by a fine external thread.

A slurry valve comprising a valve body having an inlet and an outlet, one of which has a valve seat for seating a valve closure member carried on a valve stem;

• a drive member threadably engaged with the valve stem and rotatable relative to the valve stem to axially move the valve stem and closure member relative to the valve seat to open and close the inlet or outlet;
• a driving means for rotating the drive member;
• a clutch mechanism having a clutch body with an internally threaded bore for threadably receiving the valve stem;
• andclamping means actuable with the clutch body for clamping the clutch body to the driving means so as to lock the valve stem and drive member together and allow them to rotate in unison to grind scale from the valve seat and closure member when they are positioned against each other;
• wherein the clamping means is a pneumatic or hydraulic cylinder that produces a longitudinal force on the clutch body relative to the driving means.