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Product

BAIC GROUP

Low noise regulator basic structure

Figure 5-8 Single-seat low noise

Main parts materials

Part Name Material

WCB(ZG230-450)WCC(ZG270-500)WC6(ZG15CrMo)CF8(304)CF8M(316)CF3(304L) Bonnet, packing CF3M(316L)

304 (0Cr18Ni9)316 (0Cr17Ni12Mo2)316L (oCr17Ni14Mo2) and build-up welding Stellite Valve core, valve seat alloy 17-4PH (precipitation hardening stainless steel)

Packing PTFE R.TFE (Reinforced PTFE) Grafoil (Flexible Graphite)

Sealing gasket XB350 (asbestos rubber sheet), PTFE, flexible graphite sandwich metal

Film cover A3 (Q235 painted or powder coating) 304 (used in special cases)

Corrugated membrane NBR with polyester reinforcement

Spring 60Si2Mn 50CrVA

Valve stem 304316316L17-4PH

Other materials can be selected according to the working conditions

Design selection considerations

1. Due to the low noise valve installed in the large fluid flow rate, high differential pressure,

relatively small pressure after the valve (or even venting), the fluid produces flash evaporation,

cavitation occasions, it requires (after the valve) pipeline can not be too small, in particular, the

capacity of the valve can not be too small.

2. Because the low-noise valve contains many inner parts (see the basic structure diagram), the

recommended design method: the valve caliber should be larger than the diameter of the valve

seat by one grade of selection.

1004 Type Pneumatic Membrane Low Noise Single-Seat Regulator

The dangers of noise to humans and environment pollution are well known.

Three reasons (ways) for noise generated by the regulator: mechanical noise, liquid power noise, air power

noise.

When the differential pressure before and after the valve is large, venting after the valve, cavitation occasions,

there will be different degrees of excessive noise generation, when the noise exceeds the standard, you must

choose a low-noise regulator.

26

Product

BAIC GROUP

Main technical parameters

Nominal diameter DN (mm) 20 25 32 40 50

Valve seat diameter dn (mm) 10 12 15 20 10 12 15 20 25 32 32 40 32 40 50

Rated flow

coefficient (KV)

Linear 1.8 2.8 4.4 6.9 1.8 2.8 4.4 6.9 11 17.6 17.6 27.5 17.6 27.5 44

percent

Equal 1.6 2.5 4.0 6.3 1.6 2.5 4.0 6.3 10 16 16 25 16 25 40

Rated stroke L 16 25

Effective membrane area Ae

(cm²) 280 400

Nominal diameter DN (mm) 65 80 100 125 150 200 250

Valve seat diameter dn(mm) 65 65 80 65 80 100 125 125 150 150 200 250

Rated flow

coefficient (KV)

Linear 69 69 110 69 110 176 275 275 440 440 690 1100

percent

Equal 63 63 100 63 100 160 250 250 400 400 630 900

Rated stroke L 40 60 100

Effective membrane area Ae

(cm²) 600 1000 1600

Nominal pressure PN

Mpa 1.6, 2.5, 4.0, 6.4(6.3)/2.0, 5.0, 11.0

Bar 16, 25, 40, 64(63)/20, 50, 110

Lb ANSI:Class150, Class300, Class600

Intrinsic flow characteristics Linear, equal percentage

Intrinsic adjustable ratio (R) 50

Spring (signal) range Pr

(KPa) 20～100, 40～200, 80~240, (20～60, 60~100)

Air source pressure Ps (MPa) 0.14/0.25/0.3

Allowable leakage amount Hard valve core: Class IV (10-4 × Kv) Soft valve core: Class VI, see GB/T4213-92

Normal

temperature

Operating

temperaturet(℃)

type

-20~200, -40~250, -60～250

Heat

dissipation

type

Code: S -40~350, -60~350

High

temperature

type

Code: G 350-550 (using high temperature material)

Low

temperature

type

Code: D D0

:-60~-100, D1

:-100~-200, D2:-200～-250

Regulating

cut-off type Code: Q -40～150 (Valve core reinforced PTFE) (used in special cases)

Noise control ≤80dBA

· Regulator name, model and purpose.

· Upstream pressure, downstream

pressure.

· Media name and status, media flow

rate.

· Bonnet type.

· Material requirements for valve body

and valve internal parts.

· Valve body flange standards.

· Valve body structure length (flange

surface distance L).

· Nominal diameter (mm), nominal pressure (MPa),

operating temperature and range.

· Whole machine action mode (air-to-open or air-to-close),

instrument air (air source pressure).

· Accessory requirements:

Electro-pneumatic valve positioners, air filter decompressor

, solenoid valve, holding valve, valve position transmitters,

(top-mounted) handwheels, etc.

· Other special requirements (e.g., corrosion resistance

requirements, explosion-proof level requirements, leakage

level limitation requirements, etc.).

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When ordering, users are requested to provide the following materials

Product

BAIC GROUP

Bonnet type

(normal temperature type)

Standard type

Jacketed insulation type Low temperature type (Full steam)

heat dissipation type Bellows sealed type High temperature

Allowable differential pressure Outline dimensions

Refer to 1001 type pneumatic membrane

single-seat regulator

Refer to 1001 type pneumatic membrane

single-seat regulator

Connection dimensions and standards

· Flanges according to GB/T9113-2000 (default standard). Also can be according to JB/T79.1-94, JB

/T79.2-94, or HG20592~HG20635-2009.

· Flange sealing surface type: PN16 is convex flange, PN25 is convex flange, PN40, PN64(63) are

concave-convex flanges, and the valve body is concave flange.

· Welding connection groove according to: GB/T12224-2005.

· Actuator air signal port: internal thread M10 × 1 (DN ≤ 100), internal thread M16 × 1.5 (DN> 100).

· Distance between valve body flange and flange end surface can be manufactured according to

user specified standards, such as ANSI, JIS, DIN, etc.

Ordering information