All Bonetti Piston Valves can be automated for automatic or remote control service using:

• Electric Actuators

• Pneumatic Actuators

• Hydraulic Actuators

Piston Valves can be easily outfitted with "on-off," "inching" and "modulating" type electric actuators, including tight-seal or explosion proof enclosures. These actuators are usually equipped with a handwheel for emergency manual operation as well as with control and remote warning unit.

Upon request, we can supply the following accessories:

• Local remote inverter,
• Ancillary limit switches,
• Anticondensing resistor,
• Inductive, capacitive or resistive position transmitter.

The temperature ambient range for the electric actuators is usually 4° F to 150° F (-20° C to 65° C).

Single or double acting pneumatic actuators can be installed on piston valves: single-acting actuators are of two types: "fail-closed" or "fail-open."

Upon request we can supply the following fixtures:

• Handwheel for emergency manual operation with by-pass circuit for double-acting actuators,

• Solenoid valves,
• Mechanical or proximity limit switches,
• Air filters, pressure regulators, pressure gauges, lubricator,
• Pneumatic or electropneumatic positioner for Modulating Flow Control Valves.

The temperature ambient range for the pneumatic actuators is usually 4° F to 150° F (-20° C to 65° C).

Single or double acting hydraulic actuators can be installed on piston valves: single-acting actuators are of two types: "fail-closed" or "fail-open."

The hydraulic fluid shall be supplied by a suitable pump, provided by us.

Upon request we can supply the following fixtures:

• Handwheel for emergency manual operation with by-pass circuit for double-acting actuators,

• Solenoid valves,
• Mechanical or proximity limit switches,
• Electronic positioner with position transmitter, if required, for Modulating Flow Control Valves.

The temperature ambient range for the hydraulic actuators is usually 4° F to 150° F (-20° C to 65° C).

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Figure 1039

Figure 1024

Stop Valves - Type BVe
Rating DIN 2401 - PN 40
Flanged Ends to DIN 2545 - PN 40

• Size 2-1/2" (DN 65) to 8" (DN 200)

• Standard Flanges are Raised Race, drilled
• On request, in lieu of Raised Edge, flanges are available with finishes:

  • Large female to DIN 2513

  • Groove to DIN 2512

• Face-to-Face Dimension to DIN 3202 - F1
• Standard Material Schedules: F - PN 40, M/H - PN 40, GS - PN 40
• On request, valve designed with flanges as per DIN PN 40 are available with flanges drilled as per ASME 300

Although piston valves are primarily used as on/off valves, they are also suitable for use as modulating control valves. The flow path for Bonetti Piston Valves provides an excellent means of flow control even when just the standard lantern bushing component is used, and which is not necessarily designed for modulating flow control. The modulating flow control piston valve design is fitted with a lantern busing that has a multiple hole design and which will yield and equal percentage flow characteristic. Upon request, linear or quick opening flow characteristics are also available.

• The flow control piston valve design provides tight sealing when closed, like all other Bonetti piston valves, and therefore it is not necessary to use additional valves for shut-off.

• Even with high differential pressure, our piston flow control valves do not allow vibration or noise due to their having a continually guided piston, which is very much in contrast with that of control valves with top guided contoured plugs.

• Bonetti piston modulating valves are equipped with actuators operated by means of signals coming from process controllers.

Piston Valve Figure 1071 (with non-balanced piston) one complete kit of sealing rings consists of:

• Two rings (items 2.1 and 2.2) of metal alloy reinforced lamellar graphite (figure 1001)

Piston Valve Figure 1072 (with balanced piston) one complete kit of seating rings consists of:

• Two rings (items 2.1 and 2.2) of metal alloy reinforced lamellar graphite (figure 1001)
• Two Stuffing-box rings (item 12.1 and 12.2)
• One Auto seal ring (item 35 - Figure 1009)

Spare valve ring kits consist of all the rings necessary for the complete replacement in any given valve type and size. Upon request, and for very special applications, we supply PTFE valve rings with the same dimensions as in Figure 1065 [below]. The Spare Rings are normally precompressed and their height (h) could be lower than the value shown in Figure 1065.

The recommended torques of the bonnet nuts (item 10) are listed on the table of Figure 1065.
 

Figure 1071

Figure 1072