In embodiments, a gate valve includes a valve body including a flow passage from a first opening to a second opening, and a gate channel having a first end intersecting the flow passage and a second end delineated by a third opening. A valve cover fits over the third opening. A cap fits over a valve cover opening. In embodiments, a valve cover includes a body with a second sealing surface protruding from a first sealing surface, both around an opening of the body. A cap has a third sealing surface to mate with the first sealing surface, and a fourth sealing surface congruent to the second sealing surface. In embodiments, a valve cover cap includes a body with a first sealing surface on an end of a wall. Pin flanges each have a pin hole having a pin hole axis oriented perpendicular to a center axis of the wall.

A solenoid valve with a hard seal structure includes a valve body having a fluid passage and an accommodating cavity, and a valve assembly mounted inside the accommodating cavity. The valve assembly includes a fluid inlet seat, a valve core cooperating with the fluid inlet seat, and a driving mechanism for driving reciprocating motion of the valve core. The fluid inlet seat has a guide hole that allows the value core to stretch therein, a middle section of the fluid inlet seat has fluid inlet holes, and a lower section of the fluid inlet seat has a valve core fluid passage and a fluid passage slant located at the valve core fluid passage. The valve core includes a bigger-diameter section, a slant section, a smaller-diameter section and a valve core end slant sequentially arranged from up to down.

A solenoid valve with a hard seal structure includes a valve body having a fluid passage and an accommodating cavity, and a valve assembly mounted inside the accommodating cavity. The valve assembly includes a fluid inlet seat, a valve core cooperating with the fluid inlet seat, and a driving mechanism for driving reciprocating motion of the valve core. The fluid inlet seat has a guide hole that allows the value core to stretch therein, a middle section of the fluid inlet seat has fluid inlet holes, and a lower section of the fluid inlet seat has a valve core fluid passage and a fluid passage slant located at the valve core fluid passage. The valve core includes a bigger-diameter section, a slant section, a smaller-diameter section and a valve core end slant sequentially arranged from up to down.

A manual operator a hydraulic operator is connected to move a gate within a gate valve body between a valve open and a valve closed position. The manual operator is used to operate the gate valve when the hydraulic operator is not used. On the other hand, a handwheel for the manual operator can be removed when the hydraulic actuator is used to operate the gate valve.

A manual operator a hydraulic operator is connected to move a gate within a gate valve body between a valve open and a valve closed position. The manual operator is used to operate the gate valve when the hydraulic operator is not used. On the other hand, a handwheel for the manual operator can be removed when the hydraulic actuator is used to operate the gate valve.

A globe valve, having a body through which a fluid circulation duct passes, the latter delimiting a fluid path with an inlet and an outlet, and a shutoff member housed inside a branch generally perpendicular to the body, this shutoff member being movable between a first end position, in which it shuts off the duct, and a second end position, in which it does not shut off the duct, wherein the duct has, on either side of the region of action of the shutoff member, a generally circular liquid circulation section, which is connected continuously, at least in the region of action of the shutoff member, to a section that is longer than it is wide, the body (2) not having an element that protrudes towards the inside of the duct.

A globe valve, having a body through which a fluid circulation duct passes, the latter delimiting a fluid path with an inlet and an outlet, and a shutoff member housed inside a branch generally perpendicular to the body, this shutoff member being movable between a first end position, in which it shuts off the duct, and a second end position, in which it does not shut off the duct, wherein the duct has, on either side of the region of action of the shutoff member, a generally circular liquid circulation section, which is connected continuously, at least in the region of action of the shutoff member, to a section that is longer than it is wide, the body (2) not having an element that protrudes towards the inside of the duct.

A solenoid valve with a hard seal structure includes a valve body having a fluid passage and an accommodating cavity, and a valve assembly mounted inside the accommodating cavity. The valve assembly includes a fluid inlet seat, a valve core cooperating with the fluid inlet seat, and a driving mechanism for driving reciprocating motion of the valve core. The fluid inlet seat has a guide hole that allows the value core to stretch therein, a middle section of the fluid inlet seat of fluid inlet holes, and a lower section of the fluid inlet seat has a valve core fluid passage and a fluid passage slant located at the valve core fluid passage. The valve core includes a bigger-diameter section, a slant section, a smaller-diameter section and a valve core end slant sequentially arranged from up to down.

A solenoid valve with a hard seal structure includes a valve body having a fluid passage and an accommodating cavity, and a valve assembly mounted inside the accommodating cavity. The valve assembly includes a fluid inlet seat, a valve core cooperating with the fluid inlet seat, and a driving mechanism for driving reciprocating motion of the valve core. The fluid inlet seat has a guide hole that allows the value core to stretch therein, a middle section of the fluid inlet seat of fluid inlet holes, and a lower section of the fluid inlet seat has a valve core fluid passage and a fluid passage slant located at the valve core fluid passage. The valve core includes a bigger-diameter section, a slant section, a smaller-diameter section and a valve core end slant sequentially arranged from up to down.

In one embodiment, a fluid dynamics system includes a solenoid valve including a valve body including ports including an inlet and outlet port, and a valve cavity having a direction of elongation and configured to provide fluid connectivity between ones of the ports, a solenoid coil disposed around valve cavity, and a plunger including a permanent magnet, and configured to move back-and-forth along the direction of elongation between a first and a second position in the valve cavity selectively controlling the fluid connectivity between respective ones of the ports, the valve body including shock absorber(s) to soften striking of the plunger against the valve body in the direction of elongation, and a controller configured to apply at least one current to the solenoid coil to selectively move the plunger between the first and second position, and to selectively maintain the plunger in the first position and the second position.