TIANJIN TANGHAI DONGYANG VALVE

Tianjin, China

Lugtype butterfly valve features Simple structure and easy operationEasy installation and good sealingLong service life and high reliabilityGood interchangeability of parts and cost savingLug type butterfly valve with concentric designUsing backless structure, Rubber fusion bonded on valve bodyReplaceable, resilient seatStreamlined disc, one-piece stemApproved and registered by VdS, DVGW

A gate valve is a gate plate of an opening and closing part. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve is sealed by the contact of the valve seat and the gate plate. Usually, the sealing surface will be welded with metal materials to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. The gate has a rigid gate and an elastic gate. According to the different gateplates, the gate valve is divided into a rigid gate valve and an elastic gate valve.Area of applicationMarine industry, Water supply &drainage, fire fighting, shipbuilding, water treatment, power stations, energy, food, chemical, and other systemsActuation Worm-gear/hand-wheelElectric-actuatorPneumatic-actuatorHydraulic-actuator Gate valvefeaturesAdvantages: Low flow resistance.Less effort when opening and closing.Large height and long opening and closing time.Water hammer phenomenon is not easy to produce. The reason is the long shutdown time.The medium can flow in any direction on both sides, easy to install.The structure length is small.The shape is simple, the structure length is short, the manufacturing process is good, and the application range is wide.The structure is compact, the valve has good rigidity, the channel is smooth, the flow resistance is small, the sealing surface is made of stainless steel and hard alloy, and the service life is long. The use of PTFE packing is reliable and easy to operate. Disadvantages The overall dimensions and opening height are large. The space required for installation is large.During the opening and closing process, there is relative friction between the sealing surfaces, which can easily cause scratches.Gate valves generally have two sealing surfaces, adding some difficulties to processing, grinding and maintenance.

The opening and closing part of the knife gate valve is the knife /gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The manual knife gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces, The two sealing surfaces of the most commonly used mode gate valve form a wedge, and the wedge angle varies with valve parameters, usually 50. The gate of the wedge knife gate valve can be made into a whole, called a rigid gate; it can also be made A gate that can produce a small amount of deformation to improve its process characteristics and make up for the deviation of the angle of the sealing surface during the processing.This kind of gate is called an elastic gate.When the knife gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, rely on the medium pressure to press the sealing surface of the gate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. The gate valve adopts forced sealing, that is, when the valve is closed, the gate must be forced to press against the valve seat by external force to ensure the sealing performance of the sealing surface.Types of knife gate valves: Knife gate valve driving mode: manual, electric, pneumatic, hydraulic, bevel gear, electro-hydraulic and pneumatic-hydraulic driving modes.Knife gate valve shape: two kinds of rising stemand non-rising stem.Knife gate valve material: cast iron, cast steel, carbon steel, stainless steel, fluorine lining, etc.Knife gate valve seal: hard seal, soft seal, single-sided seal, double-sided seal and other materials. The development of knife gate valves in China has gone through a short period of 20 years, and its use has expanded from ordinary fields to a wider range of industries. Coal preparation, gangue discharge and slag discharge from mines and power plants. It has developed into urban sewage treatment, and has developed from general industrial pipelines to professional pipeline systems such as food, sanitation, and medicine. The ultra-thin knife gate valve completely solves the large flow resistance of ordinary gate valves, flat gate valves, ball valves, globe valves, regulating valves, butterfly valves and other valves with its advantages of small size, small flow resistance, light weight, easy installation, and easy disassembly. , Heavy weight, difficult installation, large area and other difficult problems. After the emergence of knife gate valves, a large number of general shut-off valves and regulating valves have been replaced.Work performance and installation of knife gate valveKnife gate valve has the advantages of simple and compact structure, reasonable design, light material saving, reliable sealing, light and flexible operation, small size, smooth passage, small flow resistance, light weight, easy installation, easy disassembly, etc. It can work at a working pressure of 1.0MPa- 2.5MPa, normal work under the operating temperature of -29-650. The gate of the knife gate valve has a shearing function, which can scrape off the adhesion on the sealing surface and automatically remove the debris. The stainless steel gate can prevent the seal leakage caused by corrosion.Installation and use of knife gate valve Before installation, check the valve cavity and sealing surface and other parts, and no dirt or sand particles are allowed to adhere;The bolts of each connection part shall be evenly tightened;Check that the packing parts are required to be pressed tightly, not only to ensure the tightness of the packing, but also to ensure the flexible opening of the gate;Before installing the valve, the user must check the valve model, connection size and pay attention to the flow direction of the medium to ensure consistency with the valve requirements;When installing the valve, the user must reserve the necessary space for the valve drive;The wiring of the drive device must be carried out according to the wiring diagram;Knife gate valves must be maintained regularly, and no collision or squeezing is allowed to avoid affecting the seal. Knife gate valvetypes: single clamp type knife gate valve, single clamp type slurry gate valve, single clamp type knife gate valve, Knife type mud gate valve, knife type slag discharge gate valve, single clamp type slurry gate valve.Knife Gate valvefeaturesStructural characteristics of knife gate valve The lift-ablegate sealing surface can scrape off the adhesive on the gate and automatically remove debris.Stainless steel gate can prevent seal leakage caused by corrosion.The overall stainless steel material can prevent corrosion damage.The short structure length can save raw materials and installation space, and also effectively support the strength of the pipeline.TheScientific upper seal stuffing box design makes the upper seal safe, effective and durable.The Triangular bracket saves raw materials and ensures the required mechanical properties.The guide block on the valve body makes the gate move correctly. The squeeze block ensures effective sealing of the gate.The design of the body stiffener improves the strength of the valve body.Stainless steel valve stem is durable, and the double-headed screw can be opened and closed more quickly.The driving methodcan be selected arbitrarily.The V-type gate can be used as a regulating valve.

Dual plate swing check valvefeatures Two valve plates are fixed on the valve body along a pivotThe two springs are installed on the butterfly plate above the sealing surface.Pushed by the medium flow pressure, the spring is compressed, forcing the butterfly plate to open.When the medium flows backwards, the spring forces the valve to close.Good sealing performanceSmall size and light weightWide range of applicationsValve plate closes quicklySmall closing impactBoth horizontal and vertical pipelines can be used, easy to installSmooth flow channel, fluid resistance is smallSensitive action and good sealing performanceThe overall structureis simple and compact, beautiful appearanceLong service lifetimeand high reliability

Double offset high performance butterfly valve features:1.Double eccentric butterfly valve is also called high-performance butterfly valve, which is mainly used for water drainage in water plants, power plants, steel smelting, chemical industry, water source engineering, environmental facilities construction, etc.2. Fire-proof structureFire-proof valve is tested to API 607 4th Edition and BS 6755 Part II3. Fixed StemFixed collar is installed in the top of axis, 2-24(DN50-600), when axis breaks accident, avoid the upper part to move out of gland.4. Provide CE marked versions availableCE marked and documented valves that conform to the European Pressure Equipment Directive (PED) 97/23/EC are available in ANSI Class 150/ 300, both standard and Fire-Tightconstruction. Operating torques, construction potions and valve dimensions are exactly the same as the standard ANSI 150/300 offering.5. Convenient to maintain and upkeep valve seatsReplace axis only by taking inserts down, without disassembling disc and axis.6. Excellent for both On-Off and Control Application Superior control characteristics.Inherent flow characteristic is modified equal percentage.Wide rangeTight shut-off even in control applications.Standard lugged style valves are suitable for bidirectional dead-end service at the full pressure temperature rating of the valve 7.Single-Source Responsibility Purchase valves, actuators, and accessories, completely mounted from one source.Available with electric, manual gear, and pneumatic double acting or spring return actuators and a variety of accessories including limit switch, solenoids, and positioners.OEM service available through world-wide service centers. 8. Available in a Wide Choice of Material for a Broad Range of ApplicationsStandard body materials include ductile iron, aluminium bronze, carbon steel, stainless steel, Monel, Alloy 20. Users can also, according to requirements, select other materials.Tripleoffset butterfly valve features:The triple eccentricity refers to the addition of an angular eccentricity on the basis of the double eccentric structure, say, the sealing surface of the butterfly valve is inclined and tapered. Triple eccentric butterfly valve is also called triple offset butterfly valve. We can produce two types, one is triple eccentric multi-layer sealing butterfly valve, and the other is triple eccentric all-metal sealing butterfly valve.The triple eccentric multi-layersealing butterfly valve is accomplishedby the elasticity of the sealing ring on the valve plate, and the elasticity of the sealing ring is produced by its radial compression and flexibility. The contact surface between the sealing ring and the valve seat is an oblique cone. The contact angle between the sealing ring and the valve seat produces a slight wedge effect to make the sealing ring flexible and radially compressed. It is precisely because of the uniform contact between the valve seat and the sealing ring and the flexibility of the sealing ring that the load on the valve seat is even, so that the tightest cut-off can be achieved with the smallest torque. The elasticity generated by the torque makes the valve close tightly, regardless of the flow direction of the medium or the force of the medium.Structural features of triple eccentric multi-layersealing butterfly valve:Double safety structureNo dead zone designReplaceable sealing pairFix the structure evenly.The characteristic of the triple eccentric hard-to-hard structure is that the outer periphery of the butterfly plate is processed into an outer inclined cone, and the inner side of the sealing valve seat is processed into an inner inclined cone. At this time, the sealing section of the butterfly valve becomes an oval.The shape of the sealing surface of the butterfly plate is therefore asymmetric from top to bottom.Because the sealing surface is oblique cone shape, the larger side of the disc separated by the stem shaft presses upwards to the valve seat along the large inclined curved surface, and the smaller side discs presses down to the valve along the small inclined curved surface seat. The seal between the butterfly plate sealing ring and the valve seat does not rely on the elastic deformation of the valve seat, but completely relies on the compression of the contact surface to achieve sealing. Therefore, the opening and closing of the triple eccentric butterfly valve is basically friction-less, and as the closing pressure increases, the valve is closed tighter. From the structure principle of the triple eccentric butterfly valve, it is not difficult to see that the triple eccentric full metal sealing butterfly valve has the following advantages:All-metal sealing design, the sealing surface adopts STL /Stellite alloy surfacing technology, which solves the problem of poor sealing performance of butterfly valves under severe working conditions such as high temperature, high pressure and low temperature.The new three-eccentric structure design realizes zero friction. The performance is more stable. Sealed service life is extended. Through optimized design, the flexible opening and closing of the butterfly valve from low temperature to high temperature is ensured, which fully meets the sealing standard of zero leakage of the valve under severe working conditions.The main features of the triple offset all-metal butterfly valve:Both flow directions can bear pressure, realizing installation without flow direction restrictionReplaceable valve seat and seal ring design will not cause the whole machine to be scrapped due to seal wear problems, thereby reducing the cost of use;The difference between the all-metal sealing structure butterfly valve and the multi-layer sealing butterfly valve is that the conventional multi-layer metal sealing structure is laminated with metal sheets and graphite, and the multi-layer sealing surface is susceptible to fluid erosion and has a short service life. The triple eccentric all-metal butterfly valve sealing pair adopts all-metal forged sealing ring and surfacing stellite alloy on the sealing surface. Its advantages are erosion resistance, long life-time, wear resistance, and can be applied to various high temperatures, high pressure harsh conditions.

Wafer type butterfly valve features Simple structure and easy operationEasy installation and good sealingLong service life and high reliabilityGood interchangeability of parts and cost savingWafer type butterfly valve with concentric designUsing backless structure, Rubber fusion bonded on valve bodyReplaceable, resilient seatStreamlined disc, one-piece stemApproved and registered by VdS, DVGW

The globe valve is a tool that relies on the pressure of the valve stem to make the sealing surface of the valve flap closely fit the sealing surface of the valve seat to prevent the flow of media. It is a forced seal valve and is one of the most widely used valves.According to the direction of the channel, the globe valve is divided into four types: straight-through globe valve, direct current globe valve, angle globe valve, plunger globe valve.The structural length of the globe valve is greater than that of the gate valve, and at the same time, the fluid resistance is large. During long-term operation, the reliability of the seal is not strong.Globe valvefeatures The structure of the globevalve is simpler than the gate valve, and it is more convenient to manufacture and maintain.The sealing surface is not easy to be worn and scratched, with good sealing performance and long service life.When opening and closing, the flap traveldistanceis smallThe opening and closing torque is large, the opening and closing is more laborious, and the opening and closing timeis longer.Large fluid resistance and large power consumption.The valve flap is often eroded when fully opened. Disadvantages The fluid resistance is large, and the force required when opening and closing is large.It is not suitable for medium with particles, high viscosity and easy to coking.Poor adjustment performance