Edition: 2008-12 50)to optimize control performance and eliminate backlash. The actuators are designed to fit valves and accessories with the ISO 5211 and VDI/VDE 3845.SOMAS actuators have a torque curve corresponding to the torque demand for ball segment, butterfly, and ball valves. Low-friction seals allow for a low starting torque. Single- or dual- cylinder units are used depending on the required torque and air supply pressure. Single-acting actuators are optimised according to compact dimensions. The springs are supplied in a cartridge to reduce the risk of injury and to simplify maintenance.Adjustable travel stops are provided for both open and closed positions. SOMAS actuators are designed for optimal function in control and on/off applications. The type A pneumatic actuators are specifically made to fit the SOMAS range of valves. They can also be used with most 90 rotary valves. The A-DA actuator is double- acting and the A-SC and A-SO actuators are single-acting spring return for fail safe operation.SOMAS offer a patented backlash-free transmission friction coupling (valid for D (spring to close) Type A Ж SC Single-acting actuator Double-acting actuator Type A DA Single-acting actuator (spring to open) Type A ֖ SO > Compact designPatented backlash-free torque transmissionLow friction seals Optimized torque curve Standardised connections between valve and accessories size="-1">
Option E = ATEX design H = High temperature design HM = Hand operated LC = Locking device (closed position) V = Larger air connections X = Special design B = Bronze bushing in lever R = Reinforced Mounting pattern for valve attachment (according to ISO 5211)Shaft diameterFunction: DA = Double-acting actuator SC = Single-acting actuator (spring to close) SO = Single-acting actuator (spring to open) SCL = Single-acting actuator (spring to close), low air supply design SOL = Single-acting actuator (spring to open), low air supply design Actuator size according to the selection tableActuator...
A single-acting cylinder needs supply to and exhaust from its port to operate. This requires a 3-way valve. A 3-way valve allows fluid flow to an actuator in one position and exhausts the fluid from it in the other position. Some 3-way valves have a third position that blocks flow at all ports.
A double-acting actuator requires a 4-way valve. A 4-way valve pressurizes and exhausts two ports interdependently. A 3-position, 4-way valve stops an actuator or allows it to float. The 4-way function is a common type of directional control valve for both air and hydraulic circuits. A 3-position, 4-way valve is more common in hydraulic circuits.
Figure 8-6 depicts an all-ports-blocked, 3-way, 3-position valve. A valve of this type connected to a single-acting, weight- or spring-returned cylinder could extend, retract, or stop at any place in the stroke.
Figure 8-25 shows a weight-returned, single-acting cylinder powered by a 2-way in the at rest condition. At first sight it looks as if this circuit might work. Shifting the 2-way valve, or extending, sends fluid to the cylinder cap end and it extends. The problem comes when the 2-way returns to normal at the end of cycle. Instead of the cylinder retracting after the solenoid de-energizes, it stays in the extended position. The cylinder would only return if the valve, cylinder seals, or pipe connections leak.
shows a circuit that operates a single-acting cylinder with 2-way valves. One (NO) and one (NC) 2-way directional valve piped to the cap end cylinder port allows fluid to enter and exhaust from it. Actuating both operators simultaneously extends the cylinder. According to valve size and inlet air flow, the cylinder might not extend if just energizing the (NC) valve. If the cylinder extends with only one valve actuated, it would be slow and waste a lot of air.
Figure 8-31 shows a single-acting cylinder with a 3-way valve powering it. Energizing the solenoid, or extending, allows flow to move to the cylinder port and it extends. Deenergizing the solenoid or retracting, lets the valve shift to home position, and the cylinder retracts from outside forces.
The center condition of a 3-position valve can unload a pump, open actuator ports to tank for free movement, block actuator ports to stop movement, give regeneration, or work in combinations of these functions.
A 3/2-way valve has three ports and two positions that can be driven pneumatically, mechanically, manually or electrically via a solenoid valve. They are used, for example, to control a single-action cylinder, driving pneumatic actuators, blow-off, pressure release and vacuum applications. A valve is used to fill the cylinder, and also to exhaust it afterwards, so that a new working stroke can be realized. Therefore, a valve with two ports would not be adequate. Venting requires a third port. There are two kinds of 3/2 valves: mono-stable and bi-stable. Mono-stable 3/2-way valves can also be normally closed or normally open, just like 2/2-way valves.
Operating a single acting cylinder is a typical application of 3/2-way valves. A single acting cylinder has one pneumatic port to fill and empty the air chamber. The cylinder moves in one direction by filling the air chamber, and returns by spring force. The 3/2-way valve either fills the air chamber or vents the chamber to the atmosphere. A basic pneumatic circuit for a single acting cylinder can found on the picture below.
A double acting cylinder has two air chambers. The cylinder is moved by filling one air chamber while venting the other. Each chamber has its own connection port, so in most cases a 5/2-way valve is used to operate a double acting cylinder. However, it can also be done with two 3/2-way valves that each connect to a port of the cylinder. One valve drives the piston rod to the extended position (a1), the other valve drives the piston back to its initial position (a0) (see the picture below). One advantage of these circuits is that two different pressures can be applied to the cylinder ports, without installing a pressure regulator between the valve and the cylinder. Another advantage is that the two air chambers can be vented simultaneously, resulting in free movement of the piston rod. with a 5/2-way valve this is not possible.
3/2-way valve have three connection ports and two positions that can be driven via a solenoid valve. They are used to control a single-action cylinder, for driving pneumatic actuators, used as a blow-off valve, as pressure release valve and in vacuum applications.
A key feature is the VATRING sealing system, also used in other well-known VAT all-metal gate valves. Due to the constant sealing force these valves are built not only with manual actuators, but also with pneumatic double acting and pneumatic spring closing actuators. They are the only all-metal angle valves in the world which are pneumatic actuated!
Specification Sheet (, 603 KB)Installation Instructions, Manual Actuation (, 9.5 MB)Installation Instructions, AC-powered Hands-free 2x6 Models (, 5.9 MB)Installation Instructions, AC-powered Hands-free 2x4 Models (, 10 MB)Installation Instructions, AC Transformer (, 2.7 MB)Installation Instructions, Battery-powered Hands-free 2x6 Models (, 6.9 MB)Installation Addendum, Flush Valve (, 1.3 MB)Maintenance Guide, Hands-free Models (, 7.0 MB)User Manual, Hands-free Models (, 4.1 MB)Repair Parts (, 469 KB)Repair Parts, Hands-free Models (, 589 KB)How do I clean my actuator surface? (, 2.5 MB)Cross-reference from non-BLE Connect products to new BLE Connect products (, 437 KB)How to upgrade an existing install from non-BLE Connect to BLE Connect (, 774 KB)
The Bray Series 92/93 high pressure pneumatic actuators are ideally suited to a wide range of quarter turn applications including butterfly valves, ball valves and dampers. These rack and pinion actuators are available in Series 92 double acting (air to open, air to close) and Series 93 single acting (spring return) models.
The hydraulic cylinder consists of a hollow cylindrical tube along which a piston can slide. The term single acting is used when the fluid pressure is applied to just one side of the piston. The piston can move in only one direction, a spring being frequently used to give the piston a return stroke. The term double acting is used when pressure is applied on each side of the piston; any difference in force between the two sides of the piston moves the piston to one side or the other.
The majority of the existing soft actuators are fabricated using multistep low yield processes such as micro-moulding, solid freeform fabrication, and mask lithography. However, these methods require manual fabrication of devices, post processing/assembly, and lengthy iterations until maturity in the fabrication is achieved. To avoid the tedious and time-consuming aspects of the current fabrication processes, researchers are exploring an appropriate manufacturing approach for effective fabrication of soft actuators. Therefore, special soft systems that can be fabricated in a single step by rapid prototyping methods, such as 3D printing, are utilized to narrow the gap between the design and implementation of soft actuators, making the process faster, less expensive, and simpler. They also enable incorporation of all actuator components into a single structure eliminating the need to use external joints, adhesives, and fasteners.
The VB actuator is a single acting pneumatic clamp cylinder with built in oleo pneumatic intensifier producing a force up to 2100 daN. Compact and easy to install for clamping, holding and riveting applications.
The Parker VB actuator is a single acting pneumatic clamp cylinder with built in oleo pneumatic intensifier with a fully threaded body, for easy adjustment that it is simple and quick to install and suited to clamping, holding and riveting applications. Forces up to 2100daN. 2b1af7f3a8