Hale Hamilton – market leaders in the design and manufacture of high-performance pressure regulators
About Us Hale Hamilton is a world leader in the design, manufacture and supply of high performance, high pressure control solutions for a variety of Industrial and Defence applications. We were established in 1947, and are based in Uxbridge, Middlesex. With products ranging from individual valves through to fully integrated, bespoke control systems, Hale Hamilton is the ideal partner to satisfy the demanding requirements of our customers in the control of pressure and flow, including; pressure regulators, stop valves, relief valves, check valves and filters. Our aim is to provide our customers with the most consistent and reliable products and service, designed and manufactured to meet their requirements and delivered on time. Our quality control system has been developed to meet this aim first time, every time. We are committed to achieving these product and service standards, and to delivering total customer satisfaction. Pressure RegulatorsHale Hamilton manufactures and supplies two types of Pressure Controller are offered: dome loaded controllers and spring loaded regulators. Both types are used to reduce pressure. Both of these types of regulator are available in a variety of materials, and are suitable for a variety of applications, such as military, industrial gases, medical oxygen gases, ultra high purity gases and hydraulic fluids. All our products are adiabatically shock tested by BAM & CTE for use within high pressure oxygen applications. We also manufacture also products with PED, TPED and NATO approvals. The latest innovation includes proportional control where accuracy of 0.5% is achieved over a 380 bar pressure range. Our Products Dome-loaded regulatorsIn dome-loaded regulators, the operating force is supplied by pressurised gas in the dome. The dome gas is isolated from the outlet by a flexible diaphragm. As the area on each side of the diaphragm is the same, the set outlet pressure is about the same as the pressure in the dome. In a typical dome loaded regulator, small springs hold the valve stem and the diaphragm plate in place when there is no pressure in the unit. Restrictors control the flow of gas in the various compartments and prevent oscillation under some dynamic conditions. Dome-loaded regulators are available for high flow rates although the pressure ranges may be limited. For a given flow rate a dome-loaded regulator is more compact than a spring loaded one. Dome-loaded regulators should be installed vertical with the dome at the top. The set pressure of a dome-loaded regulator varies with temperature; an increase of 2.8°C (5°F) gives a 1% increase in outlet pressure. Dome-loaded regulators generally do not have release valves | Spring-loaded regulatorsIn spring-loaded regulators, the operating force is provided by a spring. Depending on the outlet pressure range, the internal mechanism uses either a piston or a diaphragm to isolate the process fluid from the spring compartment. The range of outlet pressure is set by the diameter of the piston or diaphragm and the strength of the spring. Spring-loaded regulators are easy to adjust but are limited in flow rate. Spring-loaded regulators can be used in any orientation. Proportional regulatorsIn a proportional regulator, the operating force is supplied by pressurised gas in the dome. A flexible diaphragm in the dome acts on a piston which in turn is acted on by the outlet pressure. The ratio of the area of the diaphragm to the area of the piston gives a proportional loading on the regulator. The diaphragm is isolated from the process fluid and the space between the diaphragm and the piston is vented. On most variants the control pressure (i.e. the pressure in the dome) is in the range 0 to 7bar (100psi).The range of outlet pressure that corresponds to this control pressure is selected by choosing an appropriately sized piston. All our pressure regulation equipment is assessed to the Pressure Equipment Directive 97/23/EC (PED). This is a European Community directive, intended to harmonise the safety requirements of pressure equipment throughout the European Economic Area. The Pressure Equipment Directive is implemented in the UK as: Statutory Instrument 1999 No. 2001 “The Pressure Equipment Regulations 1999”. The Pressure Equipment Directive requires that equipment used to retain pressure is assessed for potential hazard. The hazard category is based on contained pressure and either nominal bore (DN) or volume. It also takes into account whether the contained material is hazardous (e.g. flammable or toxic). Categories are SEP, 1, 2, 3 and 4 in order of increasing hazard. Category SEP means “Sound Engineering Practice”. Hale Hamilton - the UK’s premier manufacturer and supplier of high performance, high pressure control solutions for a variety of Industrial and Defence applications. |
