CARACTERÍSTICAS TÉCNICAS

DESCRIÇÃO DO PRODUTO

Self-acting pressure reducers are simple control valves offering accurate control while being easy to install and maintain. They control the pressure downstream of the valve without requiring pneumatic or
electrical control elements.
The pressure reducing valve RP 840 is a pilot-operated control valve
consisting of a main valve for high flow rates combined with a millibar
valve serving as pilot valve. Both valves are manufactured from
deep-drawn stainless steel featuring excellent corrosion resistance and
are arranged as a pre-mounted unit in a rack. The valve cone is
soft-sealed.
In a pressureless pipeline the main valve is closed by the pre-tensioned
spring.
If the outlet pressure falls below the pre-set nominal value, the pilot
valve is kept open by its spring. The control medium flows off towards
the valve outlet. Throttle D1 brings about a pressure drop, so that the
control pressure in the main valve control mechanism nearly
corresponds to the outlet pressure. The inlet pressure overcomes the
outlet pressure and the closing spring force and opens the main valve.
Once the outlet pressure has reached the pre-set nominal value, the
pilot valve starts to throttle. In doing so, the control pressure rises and
pushes the main valve control mechanism to a regulating position. The
throttles D1 and D2 serve to optimise the regulating behaviour. The
bypass brings about rapid closure.
If the outlet pressure exceeds the nominal value, the pilot valve closes.
The control pressure is equivalent to the inlet pressure. The main valve
closes because the control mechanism diameter is larger than the valve
seat. In addition, the spring also has a closing effect.
The valve is piped internally. The pulse lines must be installed on-site.
These valves are no shut-off elements ensuring a tight closing of the
valve. In accordance with DIN EN 60534-4 and/or ANSI FCI 70-2 they
may feature a leakage rate in closed position in compliance with the
leakage classes V optional IV:
Leakage class IV (PTFE seal cone) = 0.01 % Kvs value
Leakage class V (soft seal cone) = 1.8 x 10-5 x Δp x D* [l/h]
*D=seat diameter

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