30results about How to "Protect the sealing surface" patented technology

The invention provides an impact resisting check valve. The impact resisting check valve is composed of a valve body, a valve seat, a valve clack, an elastic piece and a valve cover. The valve clack is arranged on the valve seat in a vertical moving mode. The elastic piece is arranged on the valve clack in a sleeving mode to make the valve clack have the tendency of being closed to the valve seat. A guide sleeve and a fixing plug are fixedly arranged above a middle cavity of the valve body. The fixing plug is located in the middle of the guide sleeve and extends downwards. The upper portion of the valve clack is arranged in the guide sleeve in a vertical sliding fit mode. A receding space is arranged above the valve clack and located on the guide sleeve. A piston hole for the fixing plug to be inserted therein is formed in the valve clack. A through hole communicated with the middle cavity is formed in the bottom of the side wall of the piston hole. A buffering structure hole communicated with the piston hole and the middle cavity is formed above the through hole. The buffering structure hole vertically extends in the length direction of the buffering structure hole. The buffering structure hole is provided with an upper section and a lower section which are communicated. The moving speed of the valve clack is controlled through the relative position relation of the fixing plug and the buffering structure hole. Impact force produced between the valve clack and the valve seat when the valve clack is closed is prevented, and therefore the service life of the valve is prolonged.

A gate valve has a gate valve seat for sealing a valve body to a gate of the gate valve. The valve seat extends from a flow passage of the valve body into a cavity of the valve body parallel to an axis of the flow passage. The cavity is perpendicular to the flow passage, and the gate is disposed within the cavity. The valve seat has a tubular body having a face for contact with a gate, and an end opposite the face adjacent to and in contact with the valve body. The valve seat also includes a sleeve positioned on an inner diameter of the tubular body, the sleeve adapted to receive a shear force for shearing a member extending through the flow passage, the inner sleeve having an adjustable length.

The invention provides a lock slag and lock hopper valve with purging and flushing devices for the coal chemical industry. A purging device and a cleaning device are fixedly connected on a valve body, a journal of a valve stem and inner rings of upper and lower bearing sleeves are sprayed with WC (wolfram carbide) and Ni60, and the surface of a valve body bushing, the surface of a valve seat and the inner wall of a ball are all sprayed with the WC. Gaps between the bearing sleeves and the valve stem can be purged, a valve body cavity can be cleaned, occurrence of jamming of the valve is avoided, the valve has better wear resistance and corrosion resistance, and service life is prolonged.

The invention relates to an executing mechanism lower limiting adjusting device for a wedge-type gate valve. The device comprises a connecting support, a limiting retaining plate, adjusting bolts and check nuts. The device is characterized in that threaded holes for the adjusting bolts are formed at the bottom of the connecting support, the limiting retaining plate is mounted on a valve rod through screw-thread fit and fastened at the lower end of a connecting Haff, the adjusting bolts are mounted on the connecting support through screw-thread fit, the heads of the bolts are jacked and pressed below the limiting retaining plate, the other ends of the bolts penetrate a middle-head connecting flange of the wedge-type gate valve, and the check nuts and the adjusting bolts are fastened on the connecting support in a threaded connection manner. By the device, the phenomenon that the wedge-type gate valve cannot be normally opened due to the fact that the wedge-type gate valve is closed too tightly is avoided; the device is simple in structure, reliable and practical, stability in normal opening and closing of the valve is guaranteed, a sealing face of a gate plate and a valve seat of the wedge-type gate valve can be effectively protected, maintenance and repair frequency of the valve is lowered, and service life is prolonged.

The invention relates to a front clamping jack and tool anchor equipment for prestress tension, comprising a front clamping tool anchor device and a front clamping jack with a load cell; the front clamping tool anchor device comprises a tool anchor plate, Front push plate, back push plate, front push sleeve, tool clip, back push rod, front push spring and retraction probe rod; the front clamp jack includes jack outer cylinder, jack rear baffle, jack front baffle , a load cell, a limit plate mounting seat and a jack piston; the front clamp tool anchor device is set in the jack piston of the front clamp jack. While saving the steel strands, the present invention can also detect the retraction amount of the tool clip by retracting the probe rod, thereby improving the tensioning effect and the tensioning control precision.

The invention discloses a safety valve, comprising a valve body, the valve body is provided with a valve chamber with an upper end opening, the valve body is provided with an outlet pipe and an inlet pipe; the valve chamber is provided with a main valve seat; The upper opening of the valve cavity is fixed with a bonnet, the bonnet is provided with a gear groove with an upper opening, and the bottom of the gear groove is provided with a rotating hole for passing through the pipe; the bonnet is provided with a through plunger hole; The main control rod is connected to the hole in rotation, and the lower end of the main control rod is connected to the main valve seat in rotation; the main control rod is provided with a power gear; the plunger hole is slidingly connected to a rack rod; A valve hole, the main valve core is fixedly installed on the main control rod, and the second valve port is arranged on the main valve core; the first spring is sleeved on the main control rod; the pilot valve assembly is arranged on the valve cover; The safety valve not only has a simple structure, but also avoids the jamming phenomenon of the main valve core due to the accumulation of processing errors; at the same time, it can also avoid the collision between the main valve core and the main valve seat when opening and closing.

The invention aims to provide a large-dive-depth Kinston valve with small valve opening force. The large-dive-depth Kinston valve comprises a hand wheel, a valve rod, a valve rod power block, a bearing box, a valve body, a valve head and a reinforcement rod mechanism, wherein the hand wheel is connected with the valve rod power block through a spline, the upper portion of the valve rod is sleeved with the valve rod power block, threads on the upper portion of the valve rod are matched with the valve rod power block, the bearing box is arranged outside the valve rod power block, an upper angle thrust bearing and a lower angle thrust bearing are arranged in the bearing box, the valve rod power block is provided with a protrusion, the upper angle thrust bearing is located above the protrusion, the lower angle thrust bearing is located below the protrusion, the bearing box is connected with the valve body, the lower portion of the valve rod is located in the valve body, a valve head cover is arranged in the valve head, the head of the valve rod is located in a cavity formed by the valve head cover and the valve head, and a moving space is formed between the head of the valve rod and the valve head when the head of the valve rod is attached to the valve head cover. According to the large-dive-depth Kinston valve, a two-level reinforcement mechanism is adopted, and the valve opening force is greatly reduced. The seal surface of an end mouth of the valve is protected, and reliability of the valve is enhanced.

The invention discloses an anti-blocking regulating valve, which comprises a valve body, a valve cavity is arranged in the valve body, a valve plate is arranged in the valve cavity, and the valve plate divides the valve cavity into an upper valve cavity and a lower valve cavity , the valve plate is provided with a valve port, and the valve plate is provided with an orifice at the upper end of the valve port; the side of the valve body is provided with an outlet pipe and an inlet pipe; the upper end of the valve body is equipped with a valve cover, A shaft is arranged inside the valve cover, a throttle valve head is provided at the lower end of the shaft rod, a valve rod is connected with internal threads of the shaft rod and the throttle valve head, and a valve block is provided at the lower end of the valve rod; The valve plate is provided with a plurality of valve seat baffles around the orifice along the circumferential direction of the orifice; the valve body is provided with a valve control assembly for controlling the synchronous movement of a plurality of valve seat baffles; the anti-blocking adjustment The valve is not only simple in structure, but also prevents from being blocked.

The invention provides an internal sealing specific pressure-regulable fixed-ball ball valve, which comprises a valve body, a bonnet, a ball, a floating valve seat, valve packing and the like, wherein a plurality of sets of short adjusting screw units are mounted on the sidewall of the bonnet and are connected with a round hole plate, plungers, springs and the floating valve seat in a valve cavity, the sealing specific pressure between the ball and the floating valve seat can be regulated by rotating short screw lifters outside the sidewall of the bonnet, a plurality of sets of long adjusting screw units are mounted on the sidewall of the bonnet as well, and can regulate the sealing specific pressure upon the valve seat packing outside the sidewall of the bonnet, and because of the adoption of the the mechanism, the faults of jam and leakage can be eliminated when the valve is in use. The internal sealing specific pressure-regulable fixed-ball ball valve also comprises an automatic dirt-scraping unit, and thereby having longer operability and sealing property.

The invention relates to a high-performance slow-shut check valve which comprises a main valve and a slot-shut mechanism, wherein a swing check valve is adopted as the main valve which is mainly characterized in that one end of a main valve rotating shaft extends out of the valve body and is connected with the slow-shut mechanism; the slow-shut mechanism is of a piston structure and comprises a cylinder body, a cylinder cover, a piston rod, a piston convex disk and a piston concave disk, one end of the piston rod is fixedly connected with the rotating shaft, part of the other end of the piston rod, which is positioned in the cylinder body, is provided with a T-shaped thread, the piston convex disk and the piston concave disk are respectively provided with a positive T-shaped thread and a negative T-shaped thread and meshed with the piston rod, a convex block of the piston convex disk is movably matched with a concave hole of the piston convex disk, and a piston cavity between the piston convex disk and the piston concave disk, a piston cavity between the piston convex disk and the cylinder body, and a piston cavity between the piston convex disk and the cylinder cover are respectively communicated with three port channels of a regulating valve. The high-performance slow-shut check valve has the characteristics of low closing noise, stable slow-shut performance, convenience forinstallation, simple structure and the like, and is suitable for control valves of preventing mediums on outlet pipelines of various pump stations from flowing backwards.