bellows seal single seat control valve is a top guide structure regulating valve, the valve has the advantages of compact structure, fluid channel was streamlined S, the pressure drop, flow is large, wide adjustable range. The valve cover with bellows seal structure, can completely eliminate the possibility of the process medium leakage from the stem clearance, which is one of the significant characteristics of bellows seal valves. As the bellows element itself can be anti ageing deformation and outstanding, this valve completely overcomes the packing seal valves are packing aging and sensitive temperature difference. Secondly, using the corrugated pipe -- packing a double seal structure, safety and reliability better, therefore, it is widely used in highly toxic, the automatic control system of strong corrosive, radioactive and other rare special medium. The spool oriented area, good vibration resistance, equipped with multi spring diaphragm actuator, which has the advantages of compact structure, large output force.

The main technical parameters and performance
Valve body
Through single seat casting type ball valve
Nominal diameter 40 ~ 200mm
Nominal pressure ANSI 150, 300, 600
JIS 10, 20, 30, 1.6, 4, 6.4MPa 40K PN
Allowable working pressure 1MPa, 2 MPa, 3.5 MPa
Connection flange type: RF and RJ
According to standard of JIS B2201 ANSI B16.5 JB/T79.1
PN 1.6MPa RF JB/T79.2 concave convex surface
Welding type: weld SW (40 ~ 50mm) butt welding of BW (65 ~ 200mm)
The material HT200 ZG25 ZG1Cr18Ni9
ZG0Cr17Ni12Mo2 1.25Cr0.5Mo
5.0Cr0.5Mo or SCPH21 SCPH61 Ti
The valve cover Chang Wenxing (P): -17 ~ +230 ℃
Elongation type Ⅰ (E1): +230 ~ +350 ℃, -45 ℃ to -17 ℃
Note: the working temperature must not exceed the allowable range of various materials
The gland type bolt clamp
Filler V PTFE, PTFE impregnated asbestos packing, asbestos braid packing.
Valve components
Spool type oriented single seat plunger type valve
Flow characteristics of flow characteristics of high capacity, (see Figure 2) the percentage of properties such as (%) and the linear characteristic (L) high accuracy flow characteristics (see Figure 1)
The percentage of properties such as (%) and the linear characteristic (L) division Chatterley surfacing quick opening valve (QS)
Material 0Cr17Ni12Mo2 and division Chatterley alloy welding
Bellows material 1Cr18Ni9

Actuator
Type HA multi spring diaphragm actuator
Ethylene propylene rubber clip nylon membrane
Spring range 0.02 ~ 0.10 of 0.08 ~ 0.24MPa
The air pressure of 0.14 0.16 0.28 0.40MPa
An air supply joint Rc 1/4
Ambient temperature is -30 ~ +70 ℃
Note: the valve also can be equipped with VA5 or VA6 actuators.

Valve type gas -- gas -- open or closed
Accessory positioner, hand wheel, pneumatic valve position transmitter etc..
Performance
Leakage
Metal seat: meet the standard ANSI B16.104 grade IV, 0.01% less than the rated Cv
PTFE seat: meet the standard ANSI B 16.104 grade VI, less than the rated Cv10-7
Division Chatterley surfacing metal seat: less than the rated Cv 10-7
Back to the difference of 5% (not with a locator (locator) with 3%)
Line of ± 11% (not with a locator) + 3% (band locator)
Note: V PTFE using standard. The adjustable range of 50: 1Ordering instructions
Type and name 1 products
2 nominal diameter DN (mm
3 of the nominal pressure
4 flow characteristics
5 material of valve body and valve parts
6 medium type and temperature range
7 valve before and after the pressure (differential pressure)
The 8 seal
9 accessories