Diamond Double Seat Valve

Page 1/2


The research and development programme at DPL includes product rationalisation to ensure that future products maximise the modular concept. Valves can be upgraded without replacing the existing in-line body housing.
The valves are manufactured in our plant at Saffron Walden and are produced from the highest quality 316L forged stainless steel. The valve bodies have been designed to give full flow, low-pressure drop and to be self-draining.
DPL have developed 3 specific variations of the double seat valve;
The Standard DS version has a CIP connection on the main shaft and provides a solution for the majority of applications encountered in the process market.
The Dry Operation DSD version features a modified seat arrangement between the profiled seal and the upper spindle, which guarantees zero product or CIP loss when the valve is actuated. The DSD is also equipped with a CIP connection for cleaning the seat area as required.
The Seat Lift DSSL version has been developed for the applications where individual seat lift is required.
The advanced manufacturing methods developed by DPL ensures that the spherical housings are free from pits, crevices, gaps, sharp edges, threads, dead spaces and are self draining. All product contact surfaces are fully machined to 0.8Ra. Forged material is used for improved strength, enhanced chemical resistance and to eliminate porosity.
Careful design of the spring performance and optimum sizing of the reversible actuator on the DPL double seat valve results in a balanced operation in both air/spring or spring/air mode. This feature eliminates a common problem in manifolds where valves specified to operate at certain pressure have a reduced maximum working pressure when used in the reverse mode.

The need for flexibility and improved efficiency coupled with the demands for rapid returns on investment makes the buying process a difficult task for today's systems and process engineers.
A requirement of any product is that it matches the claims made by the manufacturer and that it offers reliability, ease of maintenance and the minimum of downtime.
To meet the rigorous demands made by the process industry DPL have developed a series of double seat valves based on our years of experience in fluid handling.
The DPL double seat valves are a development of the single seat valves, first shown in 1998. Double Seat valves guarantee that there is no cross contamination of product or CIP. The area between the two valve seats is vented to atmosphere, preventing leakage across the upper and lower valve bodies. Using double seat valves allows the system to perform cleaning, filling and emptying functions at the same time.
DPL double seat valves have been designed on a modular basis sharing common components between routing and instrument housings.
The modular design simplifies and reduces maintenance and spares costs.
Within the design of the double seat valves the use of close fitting profiled seals replace the old industry standard O rings and eliminates the problems they present.
The use of purpose designed shaft seals, PTFE bearings and ground components result in low friction/low wear and ensure liquid tight operation and environmentally sealed product lines.
Valve servicing times are reduced because the unique DPL profiled seat is easily fitted and held in place using a keep plate; this negates the need for special tools or techniques when replacing the seals.