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The water in the boiler contains salts, which are built up by the continuous evaporation. If these salts are not eliminated, bubbles and foam are formed when the density of the water increased.To prevent these lime deposits forming, the water supply must be suitably treated, with the result that certain salts are changed producing impurities which form sludge and encrusted deposits which then adhere to the sides or the bottom of the boiler and to the combustion tubes, together with particles of dirt, remains of electrodes, carbonic acid, oxygen, etc.

This leads to a high level of rust which may:

Destroy the metal plate of the boiler, causing high maintenance costs.
Produce thermic voltages, causing cracks in the metal plate and soldering cord.
Notably slow down thermic transmission, meaning an unnecessary and excessive consumption of fuel.

The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.Design in accordance with “International Standard ISO 4126-1 Safety Valves”.

The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.Design in accordance with “International Standard ISO 4126-1 Safety Valves”.

The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.Design in accordance with “ASME code section VIII Div.1”.Materials according ASME code section II and ASTM.Connections according ASME/ANSI B16.5 standard.Center to face dimensions according API-526.

The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.Design in accordance with “ASME code section VIII Div.1”.Materials according ASME code section II and ASTM.Connections according ASME B1.20.1 standard.

The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.Design in accordance with “International Standard ISO 4126-1 Safety Valves”.

The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.Design in accordance with “International Standard ISO 4126-1 Safety Valves”.

• Operating Pressure 
- (90° models) 40 to 120 psig (spring return) 
- (90° models) 20 to 120 psig (double acting) 
- (180° models) 80 psig max. pressure (except E12)

• Temperature   
- (standard) -4 to 175°F (-20 to 80°C)
- (optional) -4 to 250°F (-20 to 121°C)                  
- 40 to 175°F (-40 to 80°C)• Media  
- Air dry or lubricated; noncorrosive gas

• Rotation   
- 91.5°(96°-3° clockwise to +3°counterclockwise–DSA model)

• Materials 
- casing: aluminum alloy   
- shaft: 70-75 aluminum alloy• Finish   
- Polyester non-TGIC based powder coating• Life   
- Up to one million cycles, depending on application

• Enclosure 
- NEMA 4X (CSA approved optional)
• Temperature 
- -4 to +158°F• Connections   
- by 4 point internal terminal strip• Materials   
- aluminum base; steel cover, drive spindle, and fastenings

• Finish   
- zinc plating, two part polyurethane• Life   
- 100,000 operations minimum• Heater   
- 10 W, optional• Conduit entry   
- 1 x 1/2˝ NPT

• Power supply   
- AC - 115 V, 230V, or 400 V 50/60 Hz   
- DC - 24V• Control signal   
- 24VDC (±10%)• Limit Switches   
- 2 x SPDT, 500mA at 30 VDC/VAC• Temperature   
- -4°F (-20°C) to 158°F (70°C), low and high temp (versions available on request)• Nominal rotation   
- 90°, adjustable limit switches at each end ± 10°• Enclosure   
- NEMA 4X / IP65 (optional: NEMA 6 / IP67)• External steel parts - Stainless steel• Finish   
- Two part polyurethane• Heater   
- Standard 10 Watt• Torque control   
- Electronic, manually adjustable

Only one moving part allows for a 50 year design life with minimal maintenance.Double vane design will not produce any side loading forces on the valve stem or actuator bearings.Balanced and constant torque is applied directly to the valve stem, without any internal power loss, throughout the complete stroke.The most compact and efficient actuator design available.

Rising stem gate valve applications on natural gas pipelines, utilizing gas over oil power pressure for the actuator.Emergency shutdown.Line break protection.High thrust requirementsFor gate valves or rising stem ball and globe valves.Gate valves on product pipelines where the actuators are powered hydraulically or by nitrogen.Spring return or fail-safe applications.Self-contained actuator systems.Hydraulic piston produces smooth thrust directly to the valve stem without shock or gearing losses.Easy installation and removal provides lower maintenance cost.Hydraulically locks in any desired position.Easily controlled operating speed or variable speed for wedge type gatevalves.