62results about How to "Increase the sealing specific pressure" patented technology

The invention relates to a bi-directional sealing elastic tri-eccentric butterfly valve which has the characteristics that a packing seat, a packing component and a packing gland are successively installed to a packing box of the valve body and are fixed by locking nuts and screw rods, and then, the packing box is sealed; the packing component is pretightened by tightening the locking nuts on the screw rods, and a valve plate is fixedly connected with a valve rod through a straight pin; the axis of the valve rod is eccentric with the center of the valve plate and the center of the sealing surface of the valve plate, and the tapered axis of the sealing surface of the valve plate deflects from the cylindrical axis of the valve body; a thrust ring is installed between the valve body and the valve plate, vertical positioning is performed based on the upper and lower surfaces of the axis housing on the back surface of the valve plate as well as the stepped surfaces of the thrust ring, and the valve plate rotates around the valve rod to close or open the valve. The bi-directional sealing elastic tri-eccentric butterfly valve has the advantages that the sealing surface of the valve plate has uniform stress, and the friction and the torque are low, thereby reducing wear and effectively prolonging service life; sealing pressure ratio of a sealing ring to the valve plate can be increased to realize bi-directional sealing, and mediums cannot leak from the connection between the sealing ring and a pressing ring or the valve body.

The invention provides a conical surface soft sealing structure for a safety valve. The conical surface soft sealing structure comprises a boss-shaped valve seat. The top end of the valve seat is embedded into the bottom of a groove-shaped recoil disc. The top end of the valve seat is connected with the bottom of the recoil disc through a lower adjusting ring in a threaded mode. A groove in the recoil disc is filled with a T-shaped sealing block. The lower end of the T-shaped sealing block stretches into the top end of the valve seat. A guide rod is arranged above the recoil disc. The guide rod is connected into the recoil disc in a threaded mode. The guide rod and the recoil disc are fixed to prevent loosening through a locking nut. The guide rod presses the sealing block embedded in the recoil disc. Meanwhile, the recoil disc has the function of a pressing block. The sealing block, the recoil disc, the guide rod and the locking nut form an integrally-moving assembly. A conical surface sealing mode is adopted for the sealing face where the valve seat makes contact with the sealing block. By means of the conical surface soft sealing structure for the safety valve, it is guaranteed that the valve is opened precisely, sealed reliably, discharged stably and capable of returning back to the valve seat at the right moment at the normal temperature ranging from -46 DEG C to 200 DEG C and at the low temperature ranging from -46 DEG C to -200 DEG C.

The present invention relates to a high-temp. high-pressure valve rod action sealing mechanism and a gate valve made up by adopting said sealing mechanism. The valve cover of said sealing mechanism has the packing chamber whose opening is directed towards the internal cavity of the valve body, in the packing chamber there are successively placed several layers of packing material, packing pad and packing nut from top to bottom, the valve rod can be passed through the valve rod hole of the centre of said mechanism, on end is connected with gate board and its another end of is connected with hand wheel, the packing material and packing pad are tightly combined together by means of packing nut.

The invention belongs to the technical field of flat gate valves, and particularly relates to a hydraulic forced sealing flat gate valve which comprises a valve body, two gate plates which are symmetrically distributed on the two sides are arranged in the valve body, limiting parts are arranged at the tops and the bottoms of the gate plates, the limiting parts and the gate plates are of an integrated structure, first grooves are formed in the two sides of each limiting part, and the first grooves are communicated with the first grooves. The opposite faces of the two limiting parts are fixedly connected with reset springs, the other sides of the reset springs are fixedly connected with first valve seats, the opposite faces of the two first valve seats are fixedly connected with second valve seats, and the opposite faces of the two second valve seats located on the upper portion are provided with second grooves. A piston and a pressing block are arranged between the two second grooves, the pressing block is arranged above the piston, and a boss is arranged in the bottom of the valve body. According to the invention, the two gate plates are expanded or contracted through hydraulic transmission, so that forced sealing is realized, and abrasion to the outer surfaces of the gate plates is avoided.

The invention discloses an anti-impact stop valve sealing structure. A valve clack is arranged on a valve base, the contact surface of the valve clack and the valve base forms a sealing surface, a recessed hole is arranged in the valve clack, a wear-resisting gasket is mounted at the bottom of the recessed hole, a buffer cover is arranged on the wear-resisting gasket, one spring is sleeved at the top of the buffer cover, one spring is tightly contacted with an inner hole retracted at the bottom of a valve rod, the end portion of the valve rod is provided with a boss, and a locking nut is connected with the valve clack to be locked tightly and then to press on the boss on the end portion of the valve rod. The anti-impact stop valve sealing structure has the advantages that the problem that the sealing surface of the valve is deformed or damaged caused by impact from rapid axial force can be effectively solved, service life of a stop valve sealing pair is prolonged, and sealability is good.

The invention discloses a double-elasticity high-temperature-resistant high-pressure-resistant bidirectional sealing double-eccentric hard sealing butterfly valve, and relates to the field of valve. The butterfly valve comprises a valve body, a valve rod and a butterfly plate, wherein the valve rod penetrates through the butterfly plate and is rotationally arranged on the valve body; a positioningstep, a valve seat, a check ring and a fixing ring are sequentially arranged on the inner wall of the valve body; an elastic sealing groove is formed in the side, close to the check ring, of the valve seat; an adjusting gap X is formed between the valve seat and the check ring; a butterfly plate matched with the valve seat is fixed to the valve rod; a pressing plate ring is arranged at the end, deviating from the valve rod, of the butterfly plate; a butterfly plate sealing ring is embedded between the butterfly plate and the pressing plate ring; the butterfly plate sealing ring comprises a clamping part and a bowl-shaped elastic sealing component arranged on the outer ring of the clamping part; the clamping part is arranged between the butterfly plate and the pressing plate ring; the outer side face of the bowl-shaped elastic sealing component is an outer cone sealing face; a limiting boss is arranged on the side, close to the butterfly plate sealing ring, of the butterfly plate; andan adjusting gap Y is formed between the limiting boss and the end of the bowl-shaped elastic sealing component. The butterfly valve has the advantages of being capable of achieving bidirectional sealing and long in service life.

The invention relates to a metallic seal ball valve, in particular to an expansion type metallic seal ball valve which is used in high-temperature high-pressure medium occasions, and comprises an upper valve body, a lower valve body, a ball body arranged in a cavity of the lower valve body, a valve rod assembly used for driving the ball body, a valve seat and a seal structure, wherein the ball body is provided with a perforative through hole; the spherical surface of the ball body is provided with a penetrating deformation lance which is positioned in the same plane as the axis of the throughhole; and the valve body assembly is matched with the ball body in a rotating way and matched with the lance in an opening and closing way when the ball valve is closed. As the deformation lance is arranged on the ball body, when the ball valve is closed, the lance of the ball body is widened by the valve rod assembly, and the ball body is enlarged, thus eliminating the gap between the ball body and the metallic valve seat, realizing the seal, further improving the sealing effect, meeting the requirement of being used at high temperature and under high pressure. In addition, when the valve isopened, the ball body is diminished and separated from the valve seat seal surface; and frictional resistance is not generated when in rotation, therefore, the operation is labor-saving.

The invention relates to a double-valve-body drain valve and an assembly method thereof. The double-valve-body drain valve and the assembly method are characterized in that an outer valve body and aninner valve body are further included, the interior of the outer valve body is provided with an inlet passage, an inlet anti-flushing groove, an outer valve body middle cavity, an outlet anti-flushinggroove and an outlet passage, the inlet anti-flushing groove is of a circular arc groove structure and is arranged between the inlet passage and the outer valve body middle cavity, the outlet anti-flushing groove is of a circular arc groove structure and is arranged between the outlet passage and the outer valve body middle cavity, the inner valve body is of a bucket-shaped structure and is transversely arranged in the outer valve body middle cavity, and the inner valve body can rotate in the outer valve body middle cavity by 360 degrees with respect to the inner valve body axis; and a floating ball, a connecting rod, a valve flap and a valve seat are all arranged in an inner valve body middle cavity, the valve seat is arranged at the bottom of the outlet side of the inner valve body middle cavity, a water inlet hole is formed in the end surface of the inlet side of the inner valve body, the water inlet hole communicates with the inlet anti-flushing groove, and an aligning block is arranged at the position of an outer circle of the inner valve body. The double-valve-body drain valve and the assembly method have the advantages that the installation orientation is not affected, thesteam leakage resistance is good, and the assembly method has high precision and high qualification rate.

The invention discloses a compensation type seal plug valve. The compensation type seal plug valve comprises a valve body, a valve cover and a valve rod. A valve cavity communicating with an inlet endand a discharging end is formed in the valve body, the end, in the valve cavity, of the valve rod is provided with a plug body, a bush is arranged between the plug body and the valve body, the crosssectional area of the end, away from the valve rod, of the plug body is smaller than that of the end, close to the valve rod, of the plug body, the end, away from the plug body, of the valve rod is inkey connection with a driving device capable of driving the valve rod to rotate, the end, outside the valve body, of the valve rod is provided with an adjusting pressing plate, one side of the adjusting pressing plate is provided with a first fastener in a penetrating manner, and one end of the first fastener is in threaded fit with the valve cover. The plug valve has the advantages that the plugvalve has the compensation type seal structure, the seal failure caused by wear between the plug and the bush after long-time use can be solved, and the service life of the plug valve is prolonged.

The invention relates to a heavy-caliber high-temperature pilot-operated type control valve. The control valve mainly comprises a main control valve, an auxiliary pilot valve and compression equipment, wherein the main control valve is communicated with the auxiliary pilot valve; the auxiliary valve is communicated with an outlet cavity of the main control valve through a bypass pipeline; the bottom of the main control valve is provided with a nozzle which forms an inlet cavity; and the inlet cavity is connected and fixed with the compression equipment. The control valve has the advantages that a sealing pair structure combined by an inverse valve clack and a valve seat effectively improves the seal specific pressure of high temperature working conditions, and ensures that the device is in a reliable sealing state before startup. Because the device is under the high temperature working conditions in running and acting processes, research and development on the structure of a movable part adopts a labyrinth piston ring which is made of a metal material and is arranged between a piston and a cylinder liner, and solves the problems of movability, friction and leakage of the structure in a high-temperature medium.

The invention relates to a low-torque and two-way zero leakage all-metal sealing butterfly valve. According to the technical scheme, the low-torque and two-way zero leakage all-metal sealing butterflyvalve comprises an actuating mechanism, a thread sleeve, a lead screw, a connecting shaft, a valve rod, a bracket, a packing gland, a valve rod packing, a valve body, a valve seat, a butterfly plate,a reinforcing rib, a wedge splitting sliding component, a valve seat sealing filler, an all-metal sealing ring, a butterfly plate sealing filler, needle roller bearings and rollers. The low-torque and two-way zero leakage all-metal sealing butterfly valve adopts metal hard sealing and active sealing, sealing specific pressure is high, and zero leakage and two-way sealing are achieved; wear-proof,temperature-resistant and corrosion-resistant alloy materials are overlayed on the sealing surfaces of the valve seat and the butterfly plate, so that the service life is long; in the valve opening and closing processes, the sealing surfaces are not in contact, no friction is caused, operating torque is little, and the closing speed is high; the valve seat and the butterfly plate are of detachable structures, and are simple in structure, convenient in overhaul and low in maintenance cost; and the valve plate is relatively thin, so that the flow resistance is little, the discharge coefficientis high, and the scope of application is wide.

The invention discloses a biomass boiler smoke recycling system comprising an air preheater, a spray-type dust and sulfur removal device, a first-stage smoke plenum chamber, a second-stage smoke plenum chamber, a gas dryer, an air compressor and a high-pressure air storage tank which are sequentially connected by pipelines; and each of the pipelines is provided with a manual regulating valve with the same structure. The biomass boiler smoke recycling system is reasonable in design; the energy of smoke is sufficiently utilized, the smoke is subjected to environment-friendly treatment, and carbon monoxide gas generated by incomplete combustion is separated and reutilized, so that the favorable energy-saving and emission reduction effects are achieved; and the manual regulating valves are good in high temperature and corrosion resistance, capable of achieving a favorable sealing effect and easily regulating the sealing performance and are convenient to maintain and replace.