HTSW bellows sealed single seat regulating valveIt is a top guide structure regulating valve with a compact valve body structure, S-shaped fluid channel, low pressure drop loss, large flow rate, and wide adjustable range. The upper valve cover adopts a bellows sealing structure, which can completely eliminate the possibility of process medium leaking outward from the clearance of the valve stem movement, which is one of the significant features of bellows sealed valves. Due to the deformability and outstanding aging resistance of the bellows element itself, this regulating valve completely overcomes the weaknesses of packing aging and temperature difference sensitivity that usually exist in packing seal valves. Secondly, the double sealing structure of corrugated tube and packing is adopted for better safety and reliability. Therefore, it is widely used in automatic control systems for rare and special media such as highly toxic, highly corrosive, and radioactive substances. The valve core has a large guiding area and good vibration resistance. It is equipped with a multi spring thin film actuator, which has a compact structure and high output force.

Main technical parameters and performance of pneumatic control valve
Valve body
Type: Straight through single seat cast ball valve
Nominal diameter 40-200mm
Nominal pressure ANSI 150, 300, 600
JIS 10、20、30、40K PN 1.6、4.0、6.4MPa
Allow the use of pressures of 1MPa, 2MPa, and 3.5MPa
Connection form: flange type: RF and RJ
According to JIS B2201, ANSI B16.5, JB/T79.1 standards
PN 1.6MPa RF JB/T79.2 Concave convex surface
Welding type: socket welding SW (40-50mm), butt welding BW (65-200mm)
Material HT200 ZG25 ZG1Cr18Ni9
ZG0Cr17Ni12Mo2 1.25Cr0.5Mo
5.0Cr0.5Mo or SCPH21 SCPH61 Ti
Upper valve cover room temperature type (P): -17~+230 ℃
Elongation type I (E1):+230~+350 ℃, -45~-17 ℃
Note: The working temperature must not exceed the allowable range of various materials
Cap type bolt compression type
V-shaped PTFE packing, impregnated PTFE asbestos packing, asbestos braided packing.
Valve components
Guided single seat plunger type valve core on the valve core type
High capacity flow characteristics, (refer to Figure 2) equal percentage characteristics (%) and linear characteristics (L) high-precision flow characteristics (refer to Figure 1)
Equal percentage characteristics (%) and linear characteristics (L) of Steyr welding quick opening valve core (QS)
Material 0Cr17Ni12Mo2 and welded Stellite alloy
Bellows material 1Cr18Ni9

pneumatic control valveactuator
Type HA multi spring thin film actuator
Diaphragm Ethylene Propylene Rubber Clamp Nylon
Spring range 0.02~0.10 0.08~0.24 MPa
Gas supply pressure 0.14 0.16 0.28 0.40MPa
Air source connector Rc 1/4
Environmental temperature -30~+70 ℃
Note: This valve can also be equipped with VA5 or VA6 actuators.

Pneumatic regulationValve action typeGas - open or gas - closed
Attachment locator, handwheel mechanism, pneumatic valve position transmitter, etc.
Performance
leakage rate
Metal valve seat: Complies with ANSI B16.104 Class IV standard, less than 0.01% of rated Cv
PTFE valve seat: meets the standard ANSI B 16.104 Grade VI, less than the rated Cv10-7
Sitailai welded metal valve seat: 10-7 below rated Cv
Return difference 5% (without locator) 3% (with locator)
Linear ± 11% (without locator) ± 3% (with locator)
Note: Standard V-shaped polytetrafluoroethylene packing is used. Adjustable range 50:1

pneumatic control valveOrdering Instructions
1. Product model and name
2. Nominal diameter DN (mm)
3. Nominal pressure
4. Requirements for traffic characteristics
5. Valve body material and internal components
6. Type of medium and temperature range
7. Pressure difference before and after the valve
8. Sealing form
9. Supporting accessories