DVN Type:Pneumatic Diaphragm Valve

DVN Type:Pneumatic Diaphragm Valve

 

    • Reduced inner capacity
    • Electropolished , D.I. water cleaned , assembled ,tested and packaged in certified clean room.
    • Minimal contributions of Moisture, Oxygen and Hydrocarbon.
    • Permanently heat code laser markedMaterial traceable to original mill certificate of test.
    • Hastelloy®C-22™ and custom configurations available upon request.

    Pneumatic valves

    Pneumatic valves: Valves driven by compressed air. Pneumatic valve procurement only clear specifications, categories, pressure to meet the procurement requirements of the practice, in the current market economy environment is not perfect because pneumatic valve manufacturers for product competition, each of them are in the aerodynamic valve unified design concept, different innovations, forming their own enterprise standards and product personality. Therefore, in the procurement of pneumatic valve more detailed technical requirements, and manufacturers to achieve consensus in coordination, as an accessory to the pneumatic valve procurement contract is very necessary.

    Purpose / Pneumatic Valve

    Is a right-angle swing structure, it is used with the valve locator, can achieve proportional adjustment, V-type valve core is most suitable for all kinds of adjustment occasions, with a rated flow coefficient is large, adjustable than large, sealing effect is good, sensitive adjustment performance, small size, can be installed in a vertical. Suitable for controlling gases, steam, liquids and other media.

    It is a right-angle swing structure consisting of a V-shaped valve body, pneumatic actuator, locator and other accessories, an inherent flow characteristic of approximately equal ratio, a dual bearing structure with low starting torque, excellent sensitivity and sensing speed, and superior shear capability.

    Working principle / pneumatic valve

    The pneumatic piston actuator uses compressed air as the power source, and drives the curved arm to turn 90 degrees through the movement of the piston, so that the valve is automatically activated and closed. Its components are: adjustment bolts, actuator box, curved arm, cylinder block, cylinder shaft, piston, connecting rod, universal shaft.

    The working principle of the pneumatic control valve: The pneumatic control valve consists of the actuator and the adjustment mechanism. The actuator is the thrust component of the regulating valve, which generates the corresponding thrust according to the size of the control signal pressure and promotes the adjustment mechanism action. The valve body is the adjustment component of the pneumatic adjustment valve, which directly contacts the regulating medium to regulate the flow of the fluid.

    Category / Pneumatic Valve

    First, the main types of pneumatic valves:

    1) Pneumatic V-regulating ball valve

    2) Pneumatic O-shaped cut-off ball valve

    3) Torque cylinder ball valve

    4) Electromagnetic diaphragm valve movement picture

    5) Pneumatic straight-stroke diaphragm valve

    Second, pneumatic V-type adjustment valve

    Material / pneumatic valve

    Valve body material

    Ball ink cast iron should be the main, and noted the grade and cast iron actual physical and chemical detection data.

    Stem material

    Strive for stainless steel stem (2CR13), large-caliber valve should also be stainless steel inlaid valve stem.

    Nut material

    Cast aluminum brass or cast aluminum bronze, and the hardness and strength are greater than the stem.

    Valve lining material

    Its hardness and strength should not be greater than the stem, and in the water immersion situation with the stem, valve body does not form electrochemical corrosion.

    Materials for sealed faces

    (1) The type of pneumatic valve is different, the sealing method and the material requirements are different;

    (2) ordinary wedge gate valve, copper ring material, fixed mode, grinding method should be described;

    (3) soft sealed gate valve, valve plate lining material physical chemistry and health testing data;

    (4) Butterfly valve should be marked on the valve body sealing surface material and butterfly plate sealing surface material, their physical and chemical testing data, especially rubber hygiene requirements, anti-aging properties, wear resistance performance, usually using butyl rubber and triamcinolone ethyl propylene rubber, etc. , is strictly prohibited to mix with recycled rubber.

    Valve shaft filler

    (1) Because of the pneumatic valve in the pipe network, usually open and close is not frequent, requires fillers to be inactive for several years, fillers are not aging, long-term sealing effect;

    (2) Valve shaft filler should also be subject to frequent opening and closing, the goodness of the sealing effect;

    (3) In view of the above requirements, valve shaft fillers strive to never change or not replace for more than ten years;

    (4) If the filler needs to be replaced, the pneumatic valve design should consider the condition of water pressure replacement measures.

    Operating method / pneumatic valve

    1. The direction of opening and closing when the pneumatic valve is operated shall be closed clockwise.

    2. Because the pneumatic valve in the pipe network, often manual opening and closing, the number of opening and closing turns should not be too much, that is, large-calibre valves should also be within 200-600 rpm.

    3. In order to facilitate a person's opening and closing operation, under the pressure condition of the plumber, the maximum opening and closing torque should be 240N-m.

    4. Pneumatic valve opening and closing operation end should be square, and the size of standardized, and facing the ground, so that people can be directly operated from the ground. Valves with roulette wheels are not suitable for underground pipe networks.

    5. The display disc of the degree of opening and closing of the pneumatic valve

    (1) The scale marks of the pneumatic valve opening and closing degree shall be cast on the case of the display disc after the transmission cover or the direction of conversion, all facing the ground, and the tick marks are painted with phosphor to show that they stand out;

    (2) indicate the material of the disc needle in the case of good management can be used stainless steel plate, otherwise painted steel plate, do not use aluminum leather production;

    (3) The indicator plate needle is eye-catching, fixed secure, once the opening and closing adjustment is accurate, should be locked with rivets.

    6. If the pneumatic valve is buried deep, the operating mechanism and the display disc from the ground distance of 1.5m, should be equipped with extended rod facilities, and fixed and secure, so that people from the ground observation and operation. That is to say, the valve in the pipe network open and close operation, not suitable for downhole operation.

    Daily maintenance / pneumatic valve

    1. Valve body (including variable speed transmission box body) inside and outside, first of all should be blasted to clear sand rust, and strive to electrostatic spray powder-like non-toxic epoxy resin, thickness of more than 0.3mm. When it is difficult to spray non-toxic epoxy resin with static electricity in a particularly large valve, it should also be painted and sprayed with similar non-toxic epoxy paint.

    2. The inside of the valve body and all parts of the valve plate require full corrosion protection, on the one hand, soaked in water will not rust, between the two metals do not produce electrochemical corrosion; 6.3 The sanitary requirements of anti-corrosion epoxy resin or paint in the valve body shall be reported by the appropriate authorities. Chemical physical properties should also meet the relevant requirements.

    Packed transport / pneumatic valve

    1. The two sides of the valve should be set up with a lightweight blocking plate.

    2. Medium and small-calibre valves should be tied with straw ropes and transported in containers as appropriate.

    3. Large-caliber valve also has a simple wooden strip frame solid packaging, so as not to damage the transport process.

    Universal requirements / pneumatic valves

    General requirements

    1. Pneumatic valve specifications and categories, should comply with the requirements of the pipeline design documents.

    2. The model of the pneumatic valve shall indicate the requirements of the national standard number according to it. If it is a corporate standard, you should indicate the relevant description of the model.

    3. Pneumatic valve working pressure, requires the operation pressure of the pipe, in the premise of not affecting the price, the valve can withstand the actual pressure of the pipe, pneumatic valve shut down any side should be able to withstand 1.1 times the valve pressure value without leakage, valve opening conditions, valve body should be able to withstand the requirements of twice valve pressure.

    4. Pneumatic valve manufacturing standards, should be the basis of the national standard number, if the enterprise standards, procurement contractshould be attached to the enterprise documents. Pneumatic valve standard situ country standard, The United States standard and the daily standard three specifications.

    5. The complete description of the pneumatic valve contains its specification synostion, material, connection mode, and mode of movement (wherein the mode of action is divided into 1: double action, 2: single action).

    Performance requirements

    1. When a valve is manufactured in bulk, it shall entrust an authoritative body to carry out the following performance testing:

    (1) The opening and closing moment of the valve under the working pressure condition;

    (2) Under the working pressure condition, it can ensure that the valve closes the tight number of continuous opening and closing;

    (3) The detection of the flow resistance coefficient of the valve under the water transfer condition of the pipe.

    2. The valve should be tested as follows before it leaves the factory:

    (1) The valve in the opening condition, the valve body should bear the valve pressure value of twice the internal pressure detection;

    (2) The valve closed condition, the two sides are subject to 1.1 times the valve pressure value, no leakage, but the metal sealed butterfly valve, leakage value is not greater than the relevant requirements.

    Standard Summary / Pneumatic Valve

    Standard Number Standard Chinese Name Standard English Name

    Review Rubber seals for pneumatic valves Trench dimensions and tolerances

    Review Rubber seals for pneumatic valves Dimensions series and tolerances

    ANSI/NFPA T 3.21.4 R2-2000 pneumatic valve. NFPA/T 2.6.1 R2-2000 Supplement: Hydraulic element pressure rating. inspection fatigue and the determination of pressure of the hydraulic pneumatic valve with a metal housing, broken Pneumatic valve - Pressure rating supplement to NFPA/T2.6.1 R2-2000, power component methods - for the dynamic sings of the sings Ain airing envelope of a metal fluid power valve

    BS 4151-1967 Input signal 3 to 151b/in pressure gauge pneumatic valve locator assessment method Method of the evaluating pneumatic valve valve with input signal of 3 to 15 lbf/in

    Parameter Definition / Pneumatic Valve

    Nominal pass path

    The nominal diameter, also known as the mean outer diameter (mean nominal diameter), means the symbol DN, which is the universal caliber of various pipes and pipe attachments. The pipe and pipe attachment of the same nominal diameter can be connected to each other, with interchangeability. It is not the actual sense of the pipe outer diameter or internal diameter, although its value is closer or equal to the pipe internal diameter, in order to make the pipe, pipe connection size unified, the use of the nominal diameter (also known as the caliber, the common name diameter). For example, welded steel pipe soldered steel pipe according to thickness can be divided into thin-walled steel pipe, ordinary steel pipe and thickened steel pipe. Its nominal diameter is not an outer diameter, nor is it an internal diameter, but a nominal dimension that is similar to the inner diameter of a normal steel pipe. Each nominal diameter corresponds to an outer diameter, and its internal diameter value varies with thickness. The nominal diameter can be represented by metric mm, and also in imperial. The pipe attachment is also expressed in the nominal diameter, meaning the same as the seam pipe.

    Nominal pressure

    Nominal pressure (Nominal pressure) represents the symbol PN, the maximum operating pressure allowed when applied at a certain temperature. The control valve for the carbon steel valve body refers to the maximum operating pressure allowed when applied below 200 degrees C, the maximum operating pressure allowed when applied below 120 degrees C for cast iron valve body, and the control valve for stainless steel valve body, the maximum operating pressure allowed when applied below 250 degrees C. When the operating temperature increases, the pressure resistance of the valve body decreases. For example, a carbon steel control valve with a nominal pressure of 6.4MPa (PN64) is 5.2MPa for pressure at 300 degrees C, 4.1MPa at 400 degrees C, and 2.9MPa at 450 degrees C. Therefore, the control valve nominal pressure determination is not only based on the maximum operating pressure, but also according to the maximum operating temperature and material characteristics, and not only to meet the nominal pressure is greater than the operating pressure.


  • Size

    1/4"

    3/8",1/2"

    3/4"

    Cv Value

    0.3

    0.7

    -0.7

    Orifice Size

    4.5mm

    7.8mm

    7.8mm

    Max. Working Pressure(G.)

    1Mpa

    Operating Pressure(G.)

    0.4~0.7Mpa

    Max.Working Temp.

    PCTFE:-10℃~65℃/PFA:-10℃~120℃/PI:-10℃~150℃

    Internal Leakage Allowance(He)

    1x10-10Pa.M3/S

    Test Pressure ≦1x10-2Torr

    Holding Time ≧15 sec

    External Leakage Allowance(He)

    1x10-10Pa.M3/S

    Test Pressure ≦1x10-2Torr

    Holding Time ≧1 min

    Particle Inspection(EP only)

    No count

    Pressure:60~80psi N2 Gas

    Sample Volume:1CMF

    0.1μm and Larger


  • What is Pneumatic Diaphragm Valve

    Diaphragm valves (or membrane valves) consists of a valve body with two or more ports, an elastomeric diaphragm, and a "weir or saddle" or seat upon which the diaphragm closes the valve. The valve body may be constructed from plasticmetal, wood or other materials depending on the intended use.

    There are two main categories of diaphragm valves: one type seals over a "weir" (saddle) and the other (sometimes called a "full bore or straight-through" valve) seals over a seat. In general, straight-through diaphragm valves are used in on-off applications and weir-type diaphragm valves are used for control or throttling applications. While diaphragm valves usually come in two-port forms (2/2-way diaphragm valve), they can also come with three ports (3/2-way diaphragm valves also called T-valves) and more (so called block-valves). When more than three ports are included, they generally require more than one diaphragm seat; however, special dual actuators can handle more ports with one membrane.

    Diaphragm valves can be manual or automated. Automated diaphragm valves may use pneumatic, hydraulic or electric actuators along with accessories such as solenoid valves, limit switches and positioners.

    In addition to the well known, two way shut off or throttling diaphragm valve, other types include: Three way zero deadleg valve, sterile access port, block and bleed, valbow and tank bottom valve.

     

    Diaphragm Valve application

    Diaphragm Valves are ideally suited for:

    • Corrosive applications, where the body and diaphragm materials can be chosen for chemical compatibility. (E.G. Acids, Bases etc.)
    • Abrasive applications, where the body lining can be designed to withstand abrasion and the diaphragm can be easily replaced once worn out
    • Solids entrained liquids, since the diaphragm can seal around any entrained solids and provide positive seal
    • Slurries, since the diaphragm can seal around entrained solids and provide positive seal

    1.CVD machine

    What is CVD

    hemical vapor deposition (CVD) is a vacuum deposition method used to produce high quality, high-performance, solid materials. The process is often used in the semiconductor industry to produce thin films.

    In typical CVD, the wafer (substrate) is exposed to one or more volatile precursors, which react and/or decompose on the substrate surface to produce the desired deposit. Frequently, volatile by-products are also produced, which are removed by gas flow through the reaction chamber.

    Microfabrication processes widely use CVD to deposit materials in various forms, including: monocrystallinepolycrystallineamorphous, and epitaxial. These materials include: silicon (dioxidecarbidenitrideoxynitride), carbon (fibernanofibersnanotubesdiamond and graphene), fluorocarbonsfilamentstungstentitanium nitride and various high-k dielectrics.

     

    2.Valve manifold box/panel (VMB/VMP)

    What is VMB/VMP

    Through our experiences of handling gases, we have acquired the knowledge to design and manufacture gas panel (gas box) of EPI system and MOCVD, material supply system etc.
    Achievements in our business, we are able to design and manufacture to meet customer’s request (price and specification). We can handle the hub ring air supply of liquefied gases not just only normal gases. We also support with var-ous kind of legal application.

     

  • Size

    1/4"

    3/8",1/2"

    3/4"

    Cv Value

    0.3

    0.7

    -0.7

    Orifice Size

    4.5mm

    7.8mm

    7.8mm

    Max. Working Pressure(G.)

    1Mpa

    Operating Pressure(G.)

    0.4~0.7Mpa

    Max.Working Temp.

    PCTFE:-10℃~65℃/PFA:-10℃~120℃/PI:-10℃~150℃

    Internal Leakage Allowance(He)

    1x10-10Pa.M3/S

    Test Pressure ≦1x10-2Torr

    Holding Time ≧15 sec

    External Leakage Allowance(He)

    1x10-10Pa.M3/S

    Test Pressure ≦1x10-2Torr

    Holding Time ≧1 min

    Particle Inspection(EP only)

    No count

    Pressure:60~80psi N2 Gas

    Sample Volume:1CMF

    0.1μm and Larger

     

         

    Product Grade

    AP

    BA

    EP

    Inner

    Ry≦25μm

    Ry≦25μm

    Ry≦25μm

    10μinch RA(Avg.)

    5μinch RA(Avg.)

    Surface

    Cut off length:2.5mm

    Cut off length:0.8mm

    Cut off length:0.25mm

    Roughness

    Measuring Length:12.5mm

    Measuring Length:4mm

    Measuring Length:1.25mm

    Polishing

    Machining Finish

    Machining Finish

    Electro Polishing Finish

  • Order Information

                     

    DVN

    Code

    Material Type

     

    S

    SUS316L Single Melt(Standard Type)

     

    D

    SUS316L Double Melt

     

    4S

    SUS304

     

     

    Code

    Size Type

     

     

    4

    1/4"(Standard Type)

     

     

    6

    3/8"

     

     

    8

    1/2"

     

     

    12

    3/4"

     

     

     

    Code

    Connection Type

     

     

     

    SW

    Lok(Standard Type)

     

     

     

    VM

    MFS Male

     

     

     

    VF

    MFS Female

     

     

     

    TW

    Butt Weld

     

     

     

     

    Code

    Operation Method Type

     

     

     

     

    C

    Normally Close(Standard Type)

     

     

     

     

    O

    Normally Open

     

     

     

     

     

    Code

    Option

     

     

     

     

     

    x47

    Constant Bleed φ0.3(Standard Type)

     

     

     

     

     

    x59

    Constant Bleed φ0.6

     

     

     

     

     

    M5

    L-type quick connector(SUS material)

     

     

     

     

     

     

    Code

    Grade Type

     

     

     

     

     

     

    B

    BA Grade

     

     

     

     

     

     

    P

    EP Grade

     

     

     

     

     

     

    A

    AP Grade

     

     

     

     

     

     

     

    Code

    Logo

     

     

     

     

     

     

     

    F

    FGT Logo(Standard Type)

     

     

     

     

     

     

     

    C

    Customer Logo

     

     

     

     

     

     

     

     

     

     

     

    DVN

     

     

     

     

     

     

     

    Complete Ordering Code

     
                         

    *Note:Using customer Logo launch to more than 1000 united for  one year