small diameter single seat control valve has the advantages of compact structure, with a streamlined S channel, the pressure drop, flow is large, wide adjustable range, the flow characteristics of high precision, conforms to the IEC534 standard. Valve leakage in line with ANSI B16.104 standard. Valve equipped with multi spring diaphragm actuator, which has the advantages of compact structure, large output force, the products comply with GB/T4213-92. Small diameter single seat control valve ordering instructions: the product model and name, nominal diameter DN (mm), nominal pressure, flow characteristics, body material, rated flow coefficient, medium type and temperature range, before and after the valve pressure (differential pressure), the power supply voltage and a control signal, and other special requirements.

One, the main technical parameters

Nominal diameter: 20, 25mm
Nominal pressure: ANSI 125, 150, 300, 600, JIS 10, 16, 20, 30, 40K, PN1.6, 4, 6.4MPa
Connection: flange connection type: FF, RF, RJ, LG, groove type, embedded type
Flange standards: JIS B2201-1984, ANSI B16.5-1981, GB/T9112 ~ 9124-2000
Welding weld connection: SW
Material: steel, cast stainless steel (ZG230-450) (ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, ZG00Cr18Ni12Mo2Ti), titanium etc.
The valve cover: ambient temperature (P): -17 ~ +230 ℃
Elongation type Ⅰ (E1): -45 ~ -17 ℃ +230 ℃ to +566 ℃
Elongation type II (E2I): -100 ~ -45 ℃
Elongation type II (E2W): -196 ~ -100 ℃
Note: the temperature must not exceed the allowable range of various materials.
The gland bolts type: type
Packing: V PTFE, impregnated Teflon asbestos packing, asbestos braid packing.
Valve components
Valve type: single seat plunger type valve.
Flow characteristics: metal seat features such as the percentage (%) and the linear characteristic (L), the reference flow characteristic curve
The value of Cv conforms to the IEC534-2 standard from the high precision of flow characteristics of 0.04 ~ 14
Soft seat features such as the percentage (%) and the linear characteristic (L), the reference flow characteristic curve
Note: for PTFE seat operating temperature and pressure difference, the reference flow characteristic curve
Material: stainless steel (1Cr18Ni9Ti, 1Cr18Ni12Mo2Ti, 17-4PH, 9Cr18, 316L), stainless steel cladding division Chatterley alloy, titanium and corrosion resistant alloy

Analysis of two, flow characteristic curve

Flow characteristic curve 1, high precision (Cv=0.4 ~ 14)