Complete list of valve models
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Comprehensive list of valve models, methods for coding valve models, and explanations regarding valve numbering. Valve models should typically indicate elements such as the type of valve, drive mechanism, connection style, structural features, nominal pressure, material of the sealing surface, and material of the valve body. The standardization of valve models facilitates the design, selection, and distribution of valves. Today, there are an increasing number of types and materials for valves, and the coding of valve models has become increasingly complex. Although our country has unified standards for the designation of valve models, they are gradually failing to meet the needs of the development of the valve industry. Currently, valve manufacturers generally use a unified numbering system ； Where a unified numbering method cannot be adopted, each manufacturer may develop its own numbering system based on its specific circumstances. Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 – Unit 6 Unit 7 Valve type Transmission method Connection type Structural form Seal pair material – Nominal pressure Valve body material □□□□□-□□ Unit 1: Valve type code Type Safety valve Butterfly valve Diaphragm valve Check valve Foot valve Globe valve Throttle valve Drain valve Ball valve Trap valve Plunger valve Plug valve Pressure reducing valve Gate valve Code A D G H J L P Q S U X Y Z Unit 2: Transmission method Transmission method Electromagnetic Electro-mechanical Electro-hydraulic Worm Gear Straight gear Bevel gear Pneumatic Hydraulic Pneumo-hydraulic Electric Handle Handwheel Code 0 1 2 3 4 5 6 7 8 9 No code Unit 3: Connection type Connection method Internal thread External thread Two different connection methods Flange Welding Clamp Band clamp Code 1 2 3 4 6 7 8 9 Unit 4: Structural form The structural form varies for each type of valve; please click on the corresponding method for determining the valve’s structural form. Gate valve structural form Code Open stem Wedge type Elastic gate 0 Rigid Single gate 1 Double gate 2 Parallel single gate 3 Double gate 4 Hidden stem Wedge type Single gate 5 Double gate 6 Parallel single gate 7 Double gate 8 Safety valve structural form Code Spring Sealed With fins Fully open 0 Slightly open 1 Fully open 2 With wrench Fully open 4 Unsealed Double spring slightly open 3 Slightly open 7 Fully open 8 With control mechanism Fully open 6 Pulse type 9 Lever type 5 Pressure reducing valve structural form Code Direct-acting diaphragm type 1 Direct-acting membrane type 2 Pilot piston type 3 Pilot diaphragm type 4 Pilot membrane type Unit 5: Seal pair material Material Tin-based bearing alloy (Babbitt) Liner Nitrided steel 18-8 series Stainless steel Fluoroplastic Glass Cr13 stainless steel Lined rubber Monel alloy Nylon plastic Boronized steel Lead-lined Mo2Ti stainless steel Plastic Copper alloy Rubber Cemented carbide Valve body machined directly Code B C D E F G H J M N P Q R S T X Y W When the materials of the seal surfaces of the seal pair are different, the code of the material with lower hardness is used. Unit 6: The nominal pressure value is expressed directly in Arabic numerals; it is 10 times MPa. Unit 7: Valve body material – Titanium and titanium alloys, carbon steel, Cr13 series stainless steel, chromium-molybdenum steel, malleable cast iron, aluminum alloys, 18-8 series stainless steel, ductile cast iron, Mo2Ti series stainless steel, plastics, copper and copper alloys, chromium-molybdenum-vanadium steel, gray cast iron. Codes: A, C, H, I, K, L, P, Q, R, S, T, V, Z. This field is omitted for gray cast iron low-pressure valves and steel medium-pressure valves. Example: Z543H-16C – A flat gate valve with bevel gear drive and flange connection, with a nominal pressure of 1.6 MPa; the valve body material is carbon steel. Naming of valves: Valves are named based on their drive method, connection type, structural design, lining material, and type. However, the following is omitted in the naming: (1) In the connection type: “flange”. (2) In terms of structural type: a: \"Visible stem\", \"elastic\", \"rigid\" and \"single gate\" for gate valves” ； b: “Straight-through type” for stop valves and throttle valves” ； c: “Floating” and “through-type” of ball valves” ； d: “Vertical plate type” of butterfly valve” ； e: “Ridge-style” for diaphragm valves” ； f: “Sealing material” and “through-type” of the plug valve” ； g: “Straight-through” and “single-disc” types of check valves” ； h: “Unsealed” of the safety valve. (3) The name of the material in the valve seat sealing surface. A comprehensive guide to valve spools: Often, people use the valve spool as if it were a valve disc, which is actually a serious mistake. The valve spool is part of the valve body itself. Generally, valve spools are classified using 50/25 as a standard. Now you should understand it – when the valve body has a diameter of DN500, the valve spool’s diameter is 250 MM. By applying this logic consistently, everything will be clear. It’s simply half of that value. Everyone should learn this. Goodbye! Future trends in global valves: With the development of advanced foreign technologies, a range of new types of complete systems and individual units have emerged. The development of new valve-related complete sets of equipment is characterized by larger size, higher parameters, high-performance automation, and integration, in line with the control methods for such equipment. Over the past 20 years, the control methods for valves abroad have also seen significant development. In addition to the common manual, mechanical, electric, pneumatic, and hydraulic drive types, there is an increasing variety of valves with electro-hydraulic, pneumatic-hydraulic, and automatically controlled operations, and these types are set to see further development. Such as refining equipment. The largest refineries have a capacity of 36.4 million tons per year (the Virgin Islands in the Caribbean) and 30 million tons per year (Venezuela). At present, there are nearly 30 refineries with a capacity of over 20 million tons per year ； The processing capacity of the largest unit’s refinery vacuum distillation unit reaches 24 million tons per year, that of the catalytic cracking unit reaches 8.24 million tons per year, and that of the hydrocracking unit reaches 3.2 million tons per year. As the devices become larger, valves also have to become bigger, and control methods are shifting toward automation. In recent years, long-distance pipelines have developed rapidly. The main reason for this is their low cost, which is only 1/3 of that of railway transportation ； Second, it is buried underground, making it difficult to damage ； Third, pipeline construction is fast and requires less investment. Therefore, the demand for valves used in long-distance pipelines has increased significantly in recent years. The maximum capacity of power generation units is 3 million kW for two-axis thermal power units, 1.2 million kW for single-axis thermal power units, and 1.3 million kW for nuclear power units. Among the valves that come as part of these complete sets, the diameter of the largest flat gate valves reaches 1620 mm and 2000 mm ； Maximum butterfly valve diameter: 9750 mm ； The maximum diameter of the ball valve is 3050 mm; excluding the weight of the actuation mechanism, the weight of the valve itself is 184 tons ； The maximum diameter of the water gate valve is 2750 mm, with a pressure capacity of up to 9 MPa. The economic benefits of larger equipment can be summarized as follows: first, improving production efficiency; second, reducing capital investment in infrastructure; and third, lowering consumption of raw materials and fuel. Compared to refining equipment with an annual processing capacity of 1 million tons, the investment per ton of product produced is reduced by 50%. Compared to two refineries with a capacity of 3 million tons per year each, a refinery with a capacity of 6 million tons per year requires only 69% of the investment, 53% less steel, 54% less land area, and 75% lower production costs; meanwhile, labor productivity increases by 170%.
8-01 Safety valve – An automatic valve that, without any external force, utilizes the pressure of the medium itself to discharge a specified amount of fluid, thereby preventing the pressure within the system from exceeding the preset safe limit. Once the pressure returns to normal, the valve closes again, preventing further outflow of the medium.
8-02 Weighted safety valve – A check valve in which a lever and weight are used to balance the pressure on the valve disc. This design can only be used on stationary equipment; the weight should generally not exceed 60 kg.
8-03 Spring-type safety valve – A safety valve that uses the force of a compressed spring to balance the pressure on the valve disc and ensure its sealing. The spring force in such valves typically should not exceed 20,000 N.
8-04 Pulse-type safety valve – This valve combines a main valve and a pilot valve; the pulse action of the pilot valve triggers the main valve. This design is commonly used in large-diameter, high-flow, and high-pressure systems.
8-05 Low-lift safety valve – A safety valve in which the valve disc opens to a height equal to 1/40 to 1/20 of the seat throat diameter.
8-06 Full-lift safety valve – A safety valve in which the valve disc opens to a height equal to or greater than 1/4 of the seat throat diameter.
8-07 All-sealed bonnet type safety valve – When activated, no medium leaks out; all fluid is discharged through an exhaust pipe. This design is suitable for flammable, explosive, or toxic media.
8-08 Half-sealed bonnet type safety valve – During operation, part of the medium is discharged via the exhaust pipe while the rest leaks from the interface between the valve cover and stem. This design is suitable for general steam applications and non-polluting media.
8-09 Exposed type safety valve – When activated, the medium is discharged directly above the valve disc. This type is suitable for environments where environmental pollution is not a concern.
8-10 Direct-loaded safety valve – A safety valve whose operation relies on mechanical loads such as weights, lever mechanisms, or springs to counteract the pressure exerted by the medium on the valve disc.
8-11 Assisted safety valve – This safety valve employs a power-assisted mechanism to open at pressures lower than its normal set point. Even if the auxiliary device fails, the valve must still meet standard requirements.
8-12 Supplementary-loaded safety valve – Before reaching its set opening pressure, this valve maintains an additional sealing force. This supplementary load may be provided by an external energy source and must be released reliably once the set pressure is attained. Its magnitude is calculated so that even if this supplementary load is not applied, the valve can still achieve its rated flow rate under conditions where inlet pressure remains below a certain percentage of the set value.
8-13 Pilot-operated safety valve – A safety valve controlled by a pilot valve; this pilot valve itself must be a direct-loaded safety valve meeting relevant standards.
8-14 Lever and weight-loaded safety valve – A safety valve in which a lever transmits force to the valve disc.
8-15 Bellows seal balance safety valve – A safety valve that uses bellows to balance backpressure, thus maintaining a constant opening pressure.
8-16 Duplex safety valve – Two spring-type safety valves connected in parallel, sharing a common inlet.
9-01 Pressure reducing valve – A valve that reduces medium pressure through throttling by its closing element; it also utilizes the energy of the medium itself to maintain downstream pressure at a predetermined level.
9-02 Piston-type pressure reducing valve – A pressure reducing valve using a piston as a sensing element to drive the valve disc.
9-03 Diaphragm-type pressure reducing valve – A pressure reducing valve using a diaphragm as a sensing element to drive the valve disc.
9-04 Air bag type pressure reducing valve – A pressure reducing valve that balances valve pressure by utilizing the pressure of medium entering an air chamber downstream.
9-05 Spring-diaphragm type pressure reducing valve – A pressure reducing valve employing both a spring and a diaphragm as sensing elements to control the movement of the valve disc.
9-06 Bellows seal type pressure reducing valve – A pressure reducing valve using a bellows mechanism to drive the valve disc.
9-07 Lever-type pressure reducing valve – A pressure reducing valve using a lever mechanism to drive the valve disc.
9-08 Fixed pressure reducing valve – A pressure reducing valve designed to maintain a constant outlet pressure.
9-09 Proportional pressure reducing valve – A pressure reducing valve in which the outlet pressure remains proportional to the inlet pressure or a reference pressure.
9-10 Fixed differential pressure reducing valve – A pressure reducing valve in which the difference between outlet and inlet pressures remains constant.
9-11 Direct-acting pressure reducing valve – A pressure reducing valve that directly controls valve disc movement based on changes in outlet pressure.
9-12 Pilot-operated pressure reducing valve – Composed of a main valve and a pilot valve; changes in outlet pressure are amplified to control the main valve’s operation.
9-13 Main valve (in pilot-operated pressure reducing valves) – The valve controlled by the pilot valve to regulate flow of the medium.
9-14 Pilot valve (in pilot-operated pressure reducing valves) – The preliminary valve that controls the operation of the main valve.
9-15 Direct-acting pressure reducing valve – A pressure reducing valve in which the force exerted by incoming medium on the valve disc acts in the same direction as the disc’s upward movement.
9-16 Reverse-acting pressure reducing valve – A pressure reducing valve in which the force exerted by incoming medium on the valve disc opposes its upward movement.
9-17 Balanced pressure reducing valve – A pressure reducing valve in which the forces exerted by incoming medium on the valve disc are nearly balanced.
10-01 Steam trap – A valve that automatically discharges condensate while preventing steam leakage.
10-02 Mechanical steam trap – A steam trap activated by changes in the condensate level, causing its closing element to operate.
10-03 Ball float steam trap – A steam trap utilizing a hollow ball floating on condensate to trigger valve operation.
10-04 Free-ball float steam trap – A steam trap in which changes in condensate level cause a free-floating ball to open or close the valve; capable of continuously discharging saturated water.
10-05 Lever-ball float steam trap – A steam trap in which changes in condensate level actuate a lever-ball mechanism; its lever design allows handling of very high flow rates.
10-06 Free-semi-ball float steam trap – A steam trap featuring a freely movable hemispherical float that functions as a valve disc; requires no hinges, levers, or linkages, making it the simplest steam trap design.
10-07 Inverted bucket steam trap – A steam trap with a downward-facing float; changes in condensate level inside the float cause valve operation. Often uses a lever mechanism to amplify buoyancy.
10-08 Open bucket force steam trap – Also known as a floating bucket steam trap; utilizes a bucket floating on condensate to activate the valve.
10-09 Hot-static force steam trap – A steam trap activated by temperature-induced changes in condensate, resulting in valve operation.
10-10 Bellows seal steam trap – A steam trap containing a low-boiling, volatile liquid within a bellows container; temperature changes cause the bellows to expand/contract, operating the valve.
10-11 Membrane-box steam trap – A steam pressure-operated valve; its operation depends on pressure imbalance between condensate and vaporized liquid within a deformable element; does not suffer from clogging.
10-12 Bimetal elements steam trap – A steam trap activated by thermal deformation of bimetallic strips; prevents blockage.
10-13 Hot-motive force steam trap – A steam trap activated by dynamic changes in condensate characteristics, resulting in valve operation.
10-14 Disc steam trap – A steam trap in which valve operation results from differences in thermal properties, static pressure, and dynamic pressure between steam and condensate.
10-15 Impulse steam trap – A steam trap activated by secondary evaporation occurring during two-stage throttling; pressure changes in steam and condensate trigger valve operation.
10-16 Orifice steam trap – A steam trap in which orifices regulate condensate discharge and reduce steam outflow.
11-01 Diaphragm valve – A valve in which a diaphragm serves as the closing element; it moves vertically along the valve stem axis, separating the actuating mechanism from the medium.
11-02 Globe diaphragm valve – A diaphragm valve whose body resembles that of a globe valve.
11-03 Weir diaphragm valve – A diaphragm valve in which a weir-shaped structure forms a seal with the diaphragm.
11-04 Wedge diaphragm valve – A diaphragm valve whose closing element resembles the single gate plate of a wedge gate valve.
12-01 Multipurpose valve – A valve designed for multiple applications.
12-02 Screw-down stop check valve – A valve combining shutoff and check functions; ideal for locations with limited installation space.
12-03 Screw-down stop check and throttle valve – A three-in-one valve performing shutoff, check, and throttling functions; widely used in oil well injection systems.
12-04 Screw-down stop check and safety valve – A three-in-one valve providing shutoff, check, and safety functions.
12-05 Check-ball valve – A dual-purpose valve functioning both as a check valve and a ball valve
8-02 Weighted safety valve – A check valve in which a lever and weight are used to balance the pressure on the valve disc. This design can only be used on stationary equipment; the weight should generally not exceed 60 kg.
8-03 Spring-type safety valve – A safety valve that uses the force of a compressed spring to balance the pressure on the valve disc and ensure its sealing. The spring force in such valves typically should not exceed 20,000 N.
8-04 Pulse-type safety valve – This valve combines a main valve and a pilot valve; the pulse action of the pilot valve triggers the main valve. This design is commonly used in large-diameter, high-flow, and high-pressure systems.
8-05 Low-lift safety valve – A safety valve in which the valve disc opens to a height equal to 1/40 to 1/20 of the seat throat diameter.
8-06 Full-lift safety valve – A safety valve in which the valve disc opens to a height equal to or greater than 1/4 of the seat throat diameter.
8-07 All-sealed bonnet type safety valve – When activated, no medium leaks out; all fluid is discharged through an exhaust pipe. This design is suitable for flammable, explosive, or toxic media.
8-08 Half-sealed bonnet type safety valve – During operation, part of the medium is discharged via the exhaust pipe while the rest leaks from the interface between the valve cover and stem. This design is suitable for general steam applications and non-polluting media.
8-09 Exposed type safety valve – When activated, the medium is discharged directly above the valve disc. This type is suitable for environments where environmental pollution is not a concern.
8-10 Direct-loaded safety valve – A safety valve whose operation relies on mechanical loads such as weights, lever mechanisms, or springs to counteract the pressure exerted by the medium on the valve disc.
8-11 Assisted safety valve – This safety valve employs a power-assisted mechanism to open at pressures lower than its normal set point. Even if the auxiliary device fails, the valve must still meet standard requirements.
8-12 Supplementary-loaded safety valve – Before reaching its set opening pressure, this valve maintains an additional sealing force. This supplementary load may be provided by an external energy source and must be released reliably once the set pressure is attained. Its magnitude is calculated so that even if this supplementary load is not applied, the valve can still achieve its rated flow rate under conditions where inlet pressure remains below a certain percentage of the set value.
8-13 Pilot-operated safety valve – A safety valve controlled by a pilot valve; this pilot valve itself must be a direct-loaded safety valve meeting relevant standards.
8-14 Lever and weight-loaded safety valve – A safety valve in which a lever transmits force to the valve disc.
8-15 Bellows seal balance safety valve – A safety valve that uses bellows to balance backpressure, thus maintaining a constant opening pressure.
8-16 Duplex safety valve – Two spring-type safety valves connected in parallel, sharing a common inlet.
9-01 Pressure reducing valve – A valve that reduces medium pressure through throttling by its closing element; it also utilizes the energy of the medium itself to maintain downstream pressure at a predetermined level.
9-02 Piston-type pressure reducing valve – A pressure reducing valve using a piston as a sensing element to drive the valve disc.
9-03 Diaphragm-type pressure reducing valve – A pressure reducing valve using a diaphragm as a sensing element to drive the valve disc.
9-04 Air bag type pressure reducing valve – A pressure reducing valve that balances valve pressure by utilizing the pressure of medium entering an air chamber downstream.
9-05 Spring-diaphragm type pressure reducing valve – A pressure reducing valve employing both a spring and a diaphragm as sensing elements to control the movement of the valve disc.
9-06 Bellows seal type pressure reducing valve – A pressure reducing valve using a bellows mechanism to drive the valve disc.
9-07 Lever-type pressure reducing valve – A pressure reducing valve using a lever mechanism to drive the valve disc.
9-08 Fixed pressure reducing valve – A pressure reducing valve designed to maintain a constant outlet pressure.
9-09 Proportional pressure reducing valve – A pressure reducing valve in which the outlet pressure remains proportional to the inlet pressure or a reference pressure.
9-10 Fixed differential pressure reducing valve – A pressure reducing valve in which the difference between outlet and inlet pressures remains constant.
9-11 Direct-acting pressure reducing valve – A pressure reducing valve that directly controls valve disc movement based on changes in outlet pressure.
9-12 Pilot-operated pressure reducing valve – Composed of a main valve and a pilot valve; changes in outlet pressure are amplified to control the main valve’s operation.
9-13 Main valve (in pilot-operated pressure reducing valves) – The valve controlled by the pilot valve to regulate flow of the medium.
9-14 Pilot valve (in pilot-operated pressure reducing valves) – The preliminary valve that controls the operation of the main valve.
9-15 Direct-acting pressure reducing valve – A pressure reducing valve in which the force exerted by incoming medium on the valve disc acts in the same direction as the disc’s upward movement.
9-16 Reverse-acting pressure reducing valve – A pressure reducing valve in which the force exerted by incoming medium on the valve disc opposes its upward movement.
9-17 Balanced pressure reducing valve – A pressure reducing valve in which the forces exerted by incoming medium on the valve disc are nearly balanced.
10-01 Steam trap – A valve that automatically discharges condensate while preventing steam leakage.
10-02 Mechanical steam trap – A steam trap activated by changes in the condensate level, causing its closing element to operate.
10-03 Ball float steam trap – A steam trap utilizing a hollow ball floating on condensate to trigger valve operation.
10-04 Free-ball float steam trap – A steam trap in which changes in condensate level cause a free-floating ball to open or close the valve; capable of continuously discharging saturated water.
10-05 Lever-ball float steam trap – A steam trap in which changes in condensate level actuate a lever-ball mechanism; its lever design allows handling of very high flow rates.
10-06 Free-semi-ball float steam trap – A steam trap featuring a freely movable hemispherical float that functions as a valve disc; requires no hinges, levers, or linkages, making it the simplest steam trap design.
10-07 Inverted bucket steam trap – A steam trap with a downward-facing float; changes in condensate level inside the float cause valve operation. Often uses a lever mechanism to amplify buoyancy.
10-08 Open bucket force steam trap – Also known as a floating bucket steam trap; utilizes a bucket floating on condensate to activate the valve.
10-09 Hot-static force steam trap – A steam trap activated by temperature-induced changes in condensate, resulting in valve operation.
10-10 Bellows seal steam trap – A steam trap containing a low-boiling, volatile liquid within a bellows container; temperature changes cause the bellows to expand/contract, operating the valve.
10-11 Membrane-box steam trap – A steam pressure-operated valve; its operation depends on pressure imbalance between condensate and vaporized liquid within a deformable element; does not suffer from clogging.
10-12 Bimetal elements steam trap – A steam trap activated by thermal deformation of bimetallic strips; prevents blockage.
10-13 Hot-motive force steam trap – A steam trap activated by dynamic changes in condensate characteristics, resulting in valve operation.
10-14 Disc steam trap – A steam trap in which valve operation results from differences in thermal properties, static pressure, and dynamic pressure between steam and condensate.
10-15 Impulse steam trap – A steam trap activated by secondary evaporation occurring during two-stage throttling; pressure changes in steam and condensate trigger valve operation.
10-16 Orifice steam trap – A steam trap in which orifices regulate condensate discharge and reduce steam outflow.
11-01 Diaphragm valve – A valve in which a diaphragm serves as the closing element; it moves vertically along the valve stem axis, separating the actuating mechanism from the medium.
11-02 Globe diaphragm valve – A diaphragm valve whose body resembles that of a globe valve.
11-03 Weir diaphragm valve – A diaphragm valve in which a weir-shaped structure forms a seal with the diaphragm.
11-04 Wedge diaphragm valve – A diaphragm valve whose closing element resembles the single gate plate of a wedge gate valve.
12-01 Multipurpose valve – A valve designed for multiple applications.
12-02 Screw-down stop check valve – A valve combining shutoff and check functions; ideal for locations with limited installation space.
12-03 Screw-down stop check and throttle valve – A three-in-one valve performing shutoff, check, and throttling functions; widely used in oil well injection systems.
12-04 Screw-down stop check and safety valve – A three-in-one valve providing shutoff, check, and safety functions.
12-05 Check-ball valve – A dual-purpose valve functioning both as a check valve and a ball valve