Description
Butterfly valves are designed for use as shut-off or regulating valves for controlling flows in heat supply systems, water supply systems, in technological processes of food, chemical, oil and gas, pulp and paper and other industries. Operating principle: The valves are opened and closed by turning the disk by 90°. Opening is done by turning the handle counterclockwise, closing - clockwise.
Pneumatic actuator with return springs PA-SA-85 is designed for automation of the control process of quarter-turn pipeline valves. The principle of operation of the pneumatic actuator with return springs is based on the movement of the built-in piston due to compressed air, which enters the system from the compressor line prepared. During operation, the cylinder piston performs translational-rotational movement. Air is supplied only on one side of the piston, and the piston is returned by the action of a return spring. In such cylinders, the return spring reduces the forward force developed by the cylinder under the action of compressed air, and the force at return to the initial position is determined by the stiffness and degree of compression of the spring.
Technical characteristics of water butterfly valves DNOVA WBV3131S-2W-W-H, body material - stainless steel AISI 304, seal - Silicon, with pneumatic actuator PA-SA-85:
|
Characteristic |
Value |
|
Type of valve |
Rotary disc |
|
Diameter |
15–100 mm |
|
Nominal pressure |
10 bar |
|
Working medium temperature |
From -50 to +180°C |
|
Application |
Food industry |
|
Type of connection |
Under weld |
|
Type of control |
Pneumatic actuator |
|
Tightness class |
A |
|
Warranty |
12 months |
Technical characteristics of pneumatic actuators with return springs DNOVA PA-SA-85 for food valves:
| Characteristic | Value |
| Type of pneumatic actuator | Single-acting |
| Actuator torque | 26 Nm |
| Control pressure | 4 ÷ 7 bar |
| Control medium | Compressed air |
| Closing / opening time at 6 bar | 2 / 2 sec |
| Average life | 500 000 closing/opening cycles |
| Air supply | G1/8" |
| Ambient air temperature | From -20 to +60 °C |
| Average service life | 10 years |
Overall and installation sizes of water butterfly valves DNOVA WBV3131S-2W-W-H, body material - stainless steel AISI 304, seal - Silicon, with pneumatic actuator PA-SA-85:
| Diameter | D, mm | t, mm | D1, mm | A, mm | H, mm | J, mm | K, mm |
| DN15 | 18 | 1.5 | 78 | 50 | 86 | 126 | 8x8 |
| DN20 | 23 | 1.5 | 78 | 50 | 86 | 126 | 8x8 |
| DN25 | 29 | 1.5 | 78 | 50 | 86 | 126 | 8x8 |
| DN32 | 35 | 1.5 | 86 | 50 | 90 | 126 | 8x8 |
| DN40 | 41 | 1.5 | 90 | 50 | 92 | 126 | 8x8 |
| DN50 | 53 | 1.5 | 106 | 52 | 104 | 133 | 10x10 |
| DN65 | 70 | 2.0 | 124 | 56 | 113 | 144 | 10x10 |
| DN80 | 85 | 2.0 | 139 | 60 | 123.5 | 160 | 10x10 |
| DN100 | 104 | 2.0 | 159 | 64 | 133.5 | 160 | 10x10 |
Dimensions and mounting sizes of pneumatic actuators with return springs DNOVA PA-SA-85 for food valves:
| Model | C, mm | D, mm |
| PA-SA-85 | 147 | 85 |
Materials of water butterfly valves DNOVA WBV3131S-2W-W-H, body material - stainless steel AISI 304, seal - Silicon, with pneumatic actuator PA-SA-85:
| № | Part Name | Material |
|---|---|---|
| 1 | Body | Stainless steel AISI 304 |
| 2 | Rotary unit | Stainless steel AISI 304 |
| 3 | Disc | Stainless steel AISI 304 |
| 4 | Seat seal | EPDM or Silicon |
| 5 | Nut | Steel A2~70 |
| 6 | Bolt | Steel A2~70 |
| 7 | Plug | ABS plastic |
| 8 | Handle | Polyamide plastic |
Construction of pneumatic actuators with return springs DNOVA PA-SA-85 for food valves:
|
№ |
Part name |
Material |
|
1 |
Air inlet fitting |
n/a |
|
2 |
Retaining ring |
Stainless steel 304 |
|
3 |
Upper cover |
Stainless steel 304 |
|
4 |
Sealing ring |
NBR |
|
5 |
Sealing ring |
NBR |
|
6 |
Piston |
Aluminum alloy 4A11 (high silicon content - 4.5% to 6%) |
|
7 |
Needle bearing |
n/a |
|
8 |
Spring |
Spring steel 65Mn |
|
9 |
Spring |
Spring steel 65Mn |
|
10 |
Needle bearing |
n/a |
|
11 |
Needle bearing |
n/a |
|
12 |
Transfer ring |
Stainless steel 304 |
|
13 |
Sealing ring |
NBR |
|
14 |
Needle bearing |
n/a |
|
15 |
Body |
Stainless steel 304 |
|
16 |
Muffler |
Brass H62 |
Specifications
Delivery
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