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A Guide to our

Pneumatic Linear Valve Actuators

Pneumatrol pneumatic linear valve actuators and control systems are designed and manufactured to operate rising stem valves such as gate valves, knife gate valves, globe valves and rising stem non-contact ball valves. Our pneumatic linear actuators have been engineered to provide specific features for the optimum functionality of the valve / actuator assembly.

Bridgeworks This design feature allows direct mounting of a host of readily available devices, including: Positioners, Switch boxes and Smart control systems, where space allows. Combined with control modules and flow amplification units, this system provides a fully modular approach to actuator control.

Direct Mounted Control Valve & Embedded Transfer Tube Option Direct mounting of any standardised control valves (including Namur interface), combined with an embedded transfer tube option eliminates the need for traditional pipe & fittings, not only reducing potential leak paths, but also reducing the overall cost. This tube allows displacement of air from spring chamber, thus eliminating the traditional pipe and compression fittings usually required. With selection of the correct control valve, it also enables partial pressurisation of the spring end when exhausting, purging potentially harmful atmospheric conditions, which may have been entrained into the vent of the actuator spring housing.

Air-Fail Control Module Pneumatrol pneumatic control modules provide end users with pre-determined control functionality. These systems monitor the available mains air supply pressure, when it falls below a preset limit, the module switches to an auxiliary supply path, which is usually provided by a separate air reservoir / tank. When the mains air supply pressure is restored, the systems change the supply back to normal operation. • ‘One-Shot Auto’ provides air-fail default position. Locks out remote control functions. • ‘Multi-Shot Auto’ with initial air-fail mode. Can be overridden by remote control signals. • ‘Multi-Shot Auto’ initial air-fail and final air-fail mode. Can initially be overridden by remote control signals, but final fail-mode takes priority.

Positioner A positioner is a device which, when fitted to a pneumatic cylinder, will control the position of the cylinder piston rod. The position of the piston rod is infinitely variable within the limits of the cylinder stroke and is a function of the incoming supply air pressure or electrical signal. Thus a positioner controlled pneumatic cylinder is particularly suitable for use in applications where an easily controlled, yet variable setting of the position of the piston rod is required.

Engineered Pneumatic Solutions

Direct Mounted Control Valves + Air Preparation

Embedded Transfer Tube Manual Override

Traditional hard-piped control variations

Double Acting or Spring Return


Air-Fail Control Module

Filter + Filter Regulator Other options: Switch Boxes / Smart Valve Units / Positioners + Flow Booster

Optional: Connector or Linear to Rotary Position Converter

DAVIS DAVIS ‘Delta’ ‘Delta’ Actuator Enquiry Form Form (Fax (Fax back; back; 01752 01752 345828) 345828) Actuator Enquiry Company; Company; Form Enquiry

Contact; Contact;

Tel; Tel;

Type of Valve; Valve: Type Type of of Valve;

Date; Date;

Fax; Fax;

Wedge Gate Wedge-Gate

Ref; Ref;

Parallel Slide Parallel-Slide Parallel-Slide


Minimum Minimum Air supply pressure; Psig MinimumAir Airsupply supplypressure; pressure: Psig Psig

Globe Knife Knife Other ? Other (please specify) Globe Globe Knife Other ?

Barg Barg Barg

Maximum supply Psig Barg Maximum Air Air Maximum supply pressure; pressure; Psig Barg Air supply pressure: Psig


Actuator & required (including any margin) Actuator Function Function & Forces Forces required (including any safety safety margin) Actuator Function & Forces required (including any safety margin) Double-Acting Double-Acting Double-Acting

Max ‘Close force’ close force: Max Max ‘Close force’

On-Off On-Off duty duty

Max Max ‘Open ‘Open force’ force’ Max open force:

On-Off duty

Modulating Modulating

Required stroke any clearance) Required stroke any clearance) Required stroke (Incl. (Incl. any(Incl. clearance)


Max Operating Max Speed Opening/Ret Closing/Ext Max Operating Operating Speed Speed: Opening/Ret Opening/Ret: Closing/Ext

Spring-Return Spring-Return Spring-Return Spring Ext/Close Spring Ext/Close Spring Ext/Close On-Off duty On-Off On-Off dutyduty

Yes* Yes*

Max force’ Max ‘Open ‘Open force’ Max open force:

Max Open/Ret Max Operating Speed: Max Speed Speed Open/Ret

Max close force:

SpringSpring-Return Ret/Open Spring-Return Spring Spring Ret/Open Ret/Open

Close/Ext Opening/Ret: Close/Ext

On-Off On-Off duty duty


Is Is initial initial Closing Closing force force less less than final seating force? than final seating force?

Max Max ‘Close ‘Close force’ force’

Max Max ‘Open ‘Open force’ force’

On-Off duty

Yes* Yes*

Max open force:


Max Open/Ret Max Operating Speed: Max Speed Speed Open/Ret

Actuator Actuator Temperature Temperature Reqd Reqd ??

Environmental Environmental conditions? conditions?

Actuator Temperature:

Interconnection Interconnection Bridgeworks Bridgeworks reqd? reqd? Yes Yes

Yes Yes No No

Accessories Accessories Environmental conditions: No No

Limit-Switches Yes, Limit-Switches reqd? reqd? Yes, Qty Positioner required? Yes Qty

Outside Outside


S/Steel S/Steel

Can opening force reduce after initial Un-Seating?

* To what? After how much opening stroke? Is initial Closing force less than final seating force? Yes*


Special considerations?

Yes Yes

No No

Mechanical with Handwheel

or Hydraulic with Hand-Pump & tank

or Hydraulic with Hand-Pump & tank Valve-Stem to Act-Rod Connector required? Yes


Preferred type? No Preferred type?

Al. alloy

No No No

S/Steel With Yes No S/Steel with handwheel With Isolation Isolation Valve? Valve? Yes Mechanical or Hydraulic withNo hand pump & tank


Additional ? Additional&Information Information ? Filter/Reg Gauge required? Yes

Limit switches required? Yes, quantity

Elec Elec details? details?



Elec details:

Preferred type? Al. alloy


Elec details:

Additional Information?

West End Business Park, Blackburn Road, Oswaldtwistle, Lancashire BB5 4WZ, United Kingdom


* From what? After how much stroke is full closing force required?

Elec Accessories Elec details? details?

YesMechanical No with Handwheel Al. Al. alloy alloy



Special Special considerations? considerations?

Valve-Stem Valve-Stem to to Act-Rod Act-Rod Connector Connector reqd? reqd?

Al. Al. alloy alloy

Manual Override Yes No Manual Override reqd? reqd? Yes No Interconnection Bridgeworks required? Positioner reqd? Yes No Positioner reqd? required? Yes Control Valve YesNo Filter/Reg & & Gauge Gauge reqd? reqd? Yes Yes Filter/Reg Manual Override required? Yes

Close/Ext Opening/Ret: Close/Ext Inside Inside

No No

*From *From what? what? After how much stroke is After how much stroke is full closing force req.? full closing force req.? Closing/Ext:

Required Stroke any clearance) Required stroke (Incl. any clearance) Required Stroke (Incl. (Incl. any clearance)

Modulating Modulating

No No

*To *To what? what? After After how how much much Opening Opening stroke? stroke?

Required Stroke any clearance) Required stroke (Incl. any clearance) Required Stroke (Incl. (Incl. any clearance)


Control Control Valve Valve reqd? reqd?

Can Can Opening Opening force force reduce reduce after initial Un-Seating ? after initial Un-Seating ?

Max ‘Close force’ close force: Max Max ‘Close force’

Modulating Modulating Modulating

Closing/Ext: +44 (0)1254 872277

With isolation valve? Yes 1 1


Pneumatrol LVA guide  
Pneumatrol LVA guide