Hydraulically operated valve and systems for use therewith

A position indicating assembly for use with a valve having a valve body and an inner valve member configured to moderate fluid flow through the valve by being movable between a first state corresponding to a first intensity of flow through the valve, and a second state corresponding to a second intensity of flow through the valve, said second intensity being greater than said first intensity, said position indicating assembly comprising:

• an indicator having:
• a first end engageable with said valve member so as to displace upon movements thereof, at least from the first state to the second state;
• an opposite second end displaceable with respect to the valve body in response to displacement of said first end, so as to facilitate in indicating the state of the valve member between the first state and the second state;
• and
• an elongate bendable portion, extending between said first end and said second end, configured, upon movement of said valve member, to transmit forces operating along the elongate bendable portion, at least from said first end to said second end, so as to displace said second end, the elongate bendable portion being further configured for damping forces operating transversely thereto by reversibly bending.

A weir type hydraulic pressure actuated valve, comprising:

• an inlet having an aperture defining an inlet central streamline axis extending therealong;
• an outlet having an aperture defining an outlet central streamline axis extending therealong, said outlet defining together with said inlet a main flow path for liquid to flow in through the valve;
• a weir disposed between the inlet and outlet, such that said central streamlines are met thereabove;
• and
• a diaphragm disposed above said weir, said diaphragm comprising:
• a circumferential portion fixedly held by said valve body;
• and
• a reinforced central portion movable with respect to said circumferential portion, by hydraulic pressure applied by said liquid, between a lower position at which said central portion is compressed against said weir, thereby sealing said flow path, and an upper position at which said central portion is spaced from said weir, thereby enabling said flow path, said central portion having a top face configured to face away from said weir, and an opposite bottom face divided into an upstream face configured to face said inlet and a downstream face configured to face said outlet;
• said central portion having a lower region with a concave face constituting a lowermost portion of said bottom face, said lower region having a first bendability allowing said lower region to maintain its shape at least during movement of the central portion at least in between said lower and upper positions, and an upper region with a circular face constituting an uppermost portion of said bottom face, said upper region having a second bendability greater than said first bendability allowing said upper region to facilitate said movement
• wherein said central portion comprises an upstream portion associated with said upstream face, and having a first volume, and an opposite downstream portion associated with said downstream face, having a second volume greater than said first volume.

A diaphragm actuated by hydraulic pressure, for use with a weir type valve having a valve body including an inlet extending into an upstream chamber, an outlet extending from a downstream chamber defining together with the inlet a main flow path for fluid to flow in through the valve, and a weir disposed therebetween, said diaphragm comprising:

• a circumferential portion configured to be fixedly held by said valve body;
• a reinforced central portion having a top face configured to face away from said weir, and an opposite bottom face divided into an upstream face configured to face said upstream chamber, and a downstream face configured to face said downstream chamber, said central portion being movable with respect to said circumferential portion, by hydraulic pressure applied by said liquid, between a lower position at which said central portion is configured to be compressed against said weir, thereby sealing said flow path, to an upper position at which said central portion is configured to be spaced from said weir, thereby enabling said flow path;
• said central portion having a lower region with a first bendability, allowing said upper region to maintain its shape at least during movement of the central portion at least in between said lower and upper positions, and an upper region with a second bendability greater than said first bendability allowing said upper region to facilitate said movement;
• wherein said lower region has a concave face, constituting a lowermost portion of said bottom face, and said upper region has a circular face constituting an uppermost portion of said bottom face, ;
• and wherein said central portion has a longitudinal axis extending tangent to an apex of the concave face, in a direction from the upstream face to the downstream face, and wherein at a cross section of the diaphragm taken along said longitudinal axis, a contour of said concave face is greater than a contour of said circular face,
• wherein said central portion comprises an upstream portion associated with said upstream face, and having a first volume, and an opposite downstream portion associated with said downstream face, having a second volume greater than said first volume.