Bells Engineering Products
874 Plymouth Road
Slough Trading Estate

T: +44 (0) 1753 567788
A valve

Engineering Products


Gate, Globe,  Check, Ball, Butterfly, Boiler Crown, Safety Relief &  Parallel Slide Valves


















































A brief guide to valve selection

The details below is a reference guide to assist with the selection of valves in industrial applications.  This is not intended to be a complete guide and our engineers can assist you will specific requirements of your application.

Gate Valve        

Gate Valve

  • Gate valves should be left in the fully open or closed position for long periods of time to assure satisfactory operation. 
  • Fine control or throttling can induce serious gate erosion.
  • Suitable for use with water, gas and chemical duties.
  • Overhead clearance for high stern, high lift valves is needed for installation and maintenance. 
  • Not suitable for service with heavy solids in suspension.
Globe Valve        

Globe Valve

  • Ideal as steam valves used as stop and control valves.
  • They are not generally suitable for handling virulent sluggish, slurry type liquids not noxious/toxic gases due to the flow and difficulty of providing an effectively packed gland.
Ball Valve    

Ball Valve

  • For high pressure / high temperature services.
  • Wide choices of material and size range.
  • Generally low torque, low pressure drop and simple valve action.
  • Not suitable for abrasive duties, high sterility requirements, coagulating fluids and throttling applications
Plug Valve        

Plug Valve

  • The rapid acting valves are available with either taper or parallel plugs. 
  • They offer a very full capacity and streamlined flow in the open position.
  • For effective operation lubricant under pressure is injected between the plug face and body seat. 
  • PTFE lined sleeves can befitted to negate the requirement for lubrication.
  • Pressure loss is minimal and high pressure easily handled with both liquids and gases.
  • Different valve types are available where product purity, solids handling or a choice of materials/linings are required.
Butterfly Valve        

Butterfly Valve

  • A wide choice of basic body/disc materials is readily available with linings ranging from natural rubber to PTFE. 
  • Excellent for systems requiring a lightweight compact unit which is equally good, in general terms, for on-off and regulation work. 
  • Large/heavy solids services should be avoided; as should too-rapid disc operation.
Diaphragm Valve        
Diaphragm Valve  
  • Suitable for on-off, throttling, pressure and high vacuum, air or hazardous chemicals.  Maintenance is practically nil. 
  • Not a high temperature valve.
  • ‘Straight-through’ versions are available.
  • Unsuitable for high pressure lines wherever instantaneous closure or opening when required.
Pinch Valve        
Pinch Valve  
  • Pinch valves are probably the simplest and most efficient valves available. 
  • They comprise a rubber hose or sleeve which is clamped in a pipeline and pinched or squeezed together to stop or control the flow. 
  • Fully open, the valve is similar to rubber lined pipe. 
  • In the fully open or fully closed positions there is little or no wear. 
  • A closed pinch valve should seal bubble tight. 
  • They are mainly used where abrasion, sewerage, solids handling and/or corrosion is a factor.  They are the ideal slurry valve and have many advantages over other types of valves in these conditions.