Abstract: A flow control valve includes a main body 1, bonnet 2, spring receiving portion 3, piston 4, spring 24, first diaphragm 27, first valve member 5, second valve member 6 and base plate 7, wherein an opening area of a hydraulic control portion composed of a valve element of the second valve member and a valve seat of the main body is changed according to a motion of the piston.

Abstract: A butterfly valve includes a valve housing (1) having a substantially cylindrical flow passage formed therein, a disc-shaped valve element (4) arranged in the flow passage so as to be rotatable therein, a stem (3) extending from the valve element (4) to its outside and supported by the valve housing (1) so as to be rotatable, and an operating unit (8) for rotating the stem (3). The rotation of the stem (3) rotates the valve element (4) in the flow passage to open and close the flow passage. A top flange (2) for mounting the operating unit (8) is formed integrally with the valve housing (1). The top flange is formed with a plurality of cutouts (12) extending from the outer peripheral edge of the top flange toward the center thereof.

Abstract: A pinch valve is provided with a main body (10) accommodating a tube body (11), a cylinder body (2) having an upper cylinder portion (17) and a lower handle support portion (3), a piston accommodated in the cylinder portion, a pressing piece (9) fixed to the piston for pressing the tube body, a cylindrical handle (1), a hollow stem (4), and a piston pusher (5, 6). The handle has a female screw portion, and a male screw portion having a pitch larger than the pitch of the female screw portion and adapted to be screwed with the female screw portion formed on the handle support portion. The stem has a male screw portion adapted to be screwed with the female screw portion of the handle on outer periphery, and is accommodated in the cylinder body. The piston pusher is inserted into the stem so that the bottom end surface thereof comes into contact with the top end of the piston and is urged toward the piston by a spring.

Abstract: A flow control valve includes a main body 1, bonnet 2, spring receiving portion 3, piston 4, spring 24, first diaphragm 27, first valve member 5, second valve member 6 and base plate 7, wherein an opening area of a hydraulic control portion composed of a valve element of the second valve member and a valve seat of the main body is changed according to a motion of the piston.

Abstract: In a constant pressure regulator according to the present invention, a diaphragm defining an air chamber with a body is clamped between the body and a cover. An air chamber defining ring provided around the air chamber is clamped between the body and the cover. The upper surface and the lower surface of the air chamber defining ring are formed with a first recess having a seal ring fitted therein for backing the annular protrusion of the diaphragm and a second recess with a seal ring fitted therein for sealing the air chamber, respectively. The diaphragm has a central cylindrical bore portion defining a fluid control potion with the plug formed on the body. A second valve chamber is defined between the diaphragm and the cover. The body is formed with a first valve chamber and an inlet flow passage, and the second valve chamber is formed with an outlet flow passage.

Abstract: A manifold valve of the invention comprises a body and respective actuators driving a plurality of valve bodies arranged within the body. The body having a valve chamber on the main flow passage side and a valve chamber on the secondary flow passage side which are communicated with each other by a connecting flow passage, and further having a main flow passage communicating with a communicating port arranged on the bottom center of the valve chamber on the main flow passage side, a branched flow passage communicating with the valve chamber on the main flow passage side, and a secondary flow passage communicating with a communicating port arranged on the bottom center of the valve chamber on the secondary flow passage side. The communicating ports on the sides of the main flow passage and the secondary flow passage are respectively provided with opening and closing valve bodies driven by the actuators.

Abstract: A temperature control unit for raw molding sand or resin-coated sand for a shell mold according to the present invention comprises a heat exchanger (A) consisting of a spiral hollow tube allowing heat carrier to flow, and a gas distribution tube assembly for making powder flow (B) for supplying gas to cause the flow of molding sand or resin-coated sand for a shell mold. Furthermore, a temperature control apparatus according to the present invention comprises a reservoir for raw molding sand or resin-coated sand for a shell mold, and said temperature control unit provided in said reservoir.

Abstract: A pinch valve of the invention comprising an elastic tube body 1, a cylinder body 4 having a cylinder portion 2 and a cylinder cover 3, a piston 11 sliding on the inner periphery of the cylinder body, a pressing piece 15 fixed to a connecting portion 13 suspended from the piston, a body 16 joined to the cylinder body and having a groove 17 receiving the tube body 1, a pair of connecting body carriers 20 engaged with grooves of the body and having a through-hole 26 receiving the tube body 1, a first and a second space portions 8, 7 formed above and under the piston 11, respectively, and a pair of air ports 10, 9 respectively communicating with the first and second space portions 8, 7. The whole pinch valve is made compact in construction.

Abstract: A pinch valve includes a body containing an elastic tube, a cylinder body having a first cylinder portion at the upper interior part and a larger diameter second cylinder portion at the lower interior part, a first piston sliding on the inner periphery of the first cylinder portion, and a second piston sliding on the inner periphery of the second cylinder portion. The first piston is installed with a first interlocking rod having a first pressing piece at its lower end and the second piston is provided with second interlocking rods having a second pressing piece at their lower ends. The pressing pieces press the tube body from the upper and lower sides, a spring is disposed between the second piston and the first pressing piece, and an opening in the cylinder body communicates with a space enclosed by the pistons and the cylinder body.

Abstract: A closed deck type cylinder block providing an optimum area ratio of opening at a top deck side, and a method for producing such cylinder block having the reduced area ratio of the opening at a reduced energy cost and with reduced labor, yet exhibiting smooth discharge of waste sand converted from a water jacket core through the opening in spite of the reduced area ratio of the opening. The cylinder block is formed with a plurality of cylinders juxtaposedly arranged to each other and a water jacket portion surrounding the cylinders. An upper end of the water jacket portion is open at a top deck and is partly covered with bridge portions. The opening has an area ratio of from 10 to 30% of a projection area of the water jacket portion at the top deck surface.

Abstract: A compact automatic valve has a cylindrical body with a sleeve inserted to move in the cylindrical body in the axial direction. A first diaphragm, having an annular joint section and an annular protrusion arranged in the outer circumferential section, is joined to one end of the sleeve. A second diaphragm, having an annular joint section and an annular protrusion arranged in the outer circumferential section, is joined to the other end of the sleeve. A first cylindrical diaphragm presser, joined to one end of the cylindrical body, presses the annular protrusion of the first diaphragm and a second cylindrical diaphragm presser, joined to the other end of the cylindrical body, presses the annular protrusion of the second diaphragm. Both the first cylindrical diaphragm presser and the second cylindrical diaphragm presser have a fluid communicating port.

Abstract: A plastic butterfly valve includes a hollow cylindrical body in which an annular seat is fixed on the inner peripheral surface of a flow passage of the body by a seat pressure foot, and a valve disk rotatably and eccentrically supported at the stem of the valve disk within the body to abut the periphery of the valve disk on the seat. The seat pressure foot is detachably fitted in one side portion of the body by an insertion/rotation mechanism. The insertion/rotation mechanism includes a plurality of circular arc projections on the outer peripheral end surface of the seat pressure foot, arcuate cutout portions arranged at positions corresponding to the projections in the body, and an engaging groove on the interior sides of the cutout groove on the interior sides of the cutout portions to guide the projections. By using the insertion/rotation mechanism, mounting and demounting the seat on and from the body can be easily carried out and assembling of the seat and the body can be carried out in a short time.

Abstract: In a vertical type three-way ball valve wherein a ball (2) fitted on a stem (8) is accommodated in a valve body (1) and a flow passage is switched by the rotation of the stem (8), the ball (2) has a first port (13), a second port (14) and a third port (15) oriented in the directions vertical to the axis of the stem (8), and a fourth port (16) oriented in the axial direction of the stem (8), wherein a flow passage formed between the first port (13) and the second port (14) and a flow passage formed between the third port (15) and the fourth port (16) are isolated from each other by a partition wall (17).