New Pilot Valve Reduces Piping Costs and Complexity

The new manual reset pilot spool valve stocked in the UK by Red Dragon Valves

The new manual reset pilot spool valve stocked in the UK by Red Dragon Valves

Process valves with pneumatic actuation can use a variety of pneumatic and electro pneumatic (solenoid) valves and instruments to achieve valve operation and failsafe actions. Multiple operating modes are used depending on how critical the process is and whether the valve needs to fail open, closed or stay put for a particular condition. In addition to commanding the valve from the plant control room and inbuilt automatic logic in the local valve controls, the facility for an operator to integrate with the conditional logic to ensure safe valve operation can be essential.

On many control valves, manual reset solenoid pilot valves such as the Nadi F03, Asco 327 or Maxseal IC04S provide this input by requiring the solenoid to be energised at the same time as an operator physically moves the button or lever so that the valve changes over. In the event of a commanded fault state, the valve returns to its original position and can’t change again without operator input. However, for systems where solenoid valves are not permitted or practical, this function has to be achieved with purely pneumatic components and would commonly be achieved with several valves in a sub circuit to give the manual reset function.

In practice, increasing the number of valves required to achieve the logic functions for the valve actuator has a knock on effectof the overall cost of the process valve, particularly for offshore systems where all the instrument piping has to be done in Hastelloy, Monel or 6MO and each additional pneumatic connection has a significant cost implication.

One way to meet this challenge is by installing the new manual reset pilot spool valve manufactured in Italy by Sitecna Srl and stocked in the UK by Red Dragon Valves. The DPXX-MR unit is designed specifically for these applications where the valve will only move from rest when the pilot pressure is applied and the button is pushed. As soon as the pilot pressure is removed the valve returns to the rest position and won’t change state again until both control inputs are initiated.

Constructed in 316L stainless steel to NACE MR01-75 and available in 3/2 and 5/2 functions for single or double acting actuator applications, the valves carry ATEX and GOST certification as standard and have traceability to EN10204 3.1.

Red Dragon Valves
Tel: 01443 772500
www.reddragonvalves.co.uk


Published: 7th March 2014

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