Hopkinsons Uniflow Slide Valves are specially designed for one way isolation and blowdown duties where there is no possibility of reversal flow.
The Hopkinsons 'Uniflow' Slide Gate Valve has been used for many years on drain, blow-down and other auxiliary services, especially in medium and high pressure installations. It is manufactured in sizes up to and including 1 1/2" bore with flange or butt weld connections according to temperature and pressure requirements. As the name implies, the design is for one-way flow only and when there is any possibility of a reverse flow, it can be used in series with a non-return valve fitted at the outlet. The Hopkinsons 'uniflow' valve is an adoption of the parallel slide valve principle but using only one disc which slides over the face of the seat, to which it is firmly held by fluid pressure in normal working conditions and by a light spring when not under pressure. The valve is fully opened or closed by a half turn of the handle or hand-wheel. To prevent rotation beyond these limits, stops are incorporated in the index plate. This plate is large, clearly marked and easy to read and can be engraved to suit foreign language requirements. No lubrication is required with this type of valve. Maintenance and the fitting of replacement parts are easily carried out as the valve can be easily dismantled without the aid of special equipment. In addition, there are no welded joints to be broken in order to gain access to the internals.
Hopkinsons offer a robust general purpose range of globe valves suitable for regulating, isolating and blowdown duties.
The replaceable seat is screwed into the body, the joint being made by accurately machined taper surfaces. An extension on the underside of the valve acts as a throttling device to protect the seating faces against the scoring or cutting action of steam during opening and closing.
For extreme service conditions such as on superheated steam drain lines, Hopkinsons have developed a new range of high performance parallel slide gate valves.
Hopkinsons® High Performance Drains are designed to give extended service life and continued tight shut off when subject to frequent operation, two phase flow, thermal shock and large pressure drops. Unique features of the valves include square discs (gates) and 'winged' seats. These provide accurate gate guidance, low seat contact stresses and enhanced wear resistance for repeatedly handling large pressure drops in the part open position.
We recommend Hopkinsons Full Bore & Venturi valves when a gate valve is required for steam or feedwater duty in medium and high pressure ranges.
Full Bore: The outstanding feature of the parallel slide design is that of maintaining fluid-tightness without the aid of wedging action. No mechanical stress is exerted between the discs, and there are no problems associated with cool-down of the fluid.
The Hopkinsons Forged Gate Valve is designed by our expert team to provide assured, consistent, and durable quality for high temperature and high pressure applications.
Our Forged Gate Valves are the latest addition to the Hopkinsons® range and offers customers choice across critical, super-critical, and ultra-super-critical steam applications. Weir's investment in research and development delivered a high integrity solution at a competitive price and lead time. Using Weir's world class engineering processes, the valve offers minimal material defects, lowering the total cost of ownership, maintenance burdens and ensuring maximum uptime throughout the service life.
We recommend the highly versatile Hopkinsons Flexi Wedge Design as gate valve which is designed for containment isolation duties.
Designed for containment isolation duties, Bolted bonnet (seal weld provision available), Pressure seal, Full Bore: The outstanding feature of the parallel slide design is that of maintaining fluid-tightness without the aid of wedging action. No mechanical stress is exerted between the discs, and there are no problems associated with cool-down of the fluid.
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Trillium Flow Technologies™, founded on a legacy of premier products and service, will continue to provide mission critical valves, pumps, and aftermarket services in oil and gas, power generation, water and wastewater, and general industry.