ISOVALVE Automatic Valve – Válvulas ISOIL
* ISOVALVE Automatic Valve – Válvulas ISOIL
One of the main features of the ISOVALVE automatic valve is that it uses the pressure of the fluid passing through it, to perform the functions which it has been designed for. The valve shutter is driven by the movement of the diaphragm, actuated through the energy of the process.
Operation The valve operation is obtained by 2 Ex (24 VDC / 115-230 VAC) solenoid valves one of them normally opened (NO) and one normally closed (NC). Tipically the valve would be situated just downstream of the meter on tank truck loading terminals or transfer pipelines of petroleum or chemicals.
Functions
The valve control circuit may be configured in different ways in order to get several function, with the same kind of valves, as follows: » non return identificated by (R) » flow limiting identificated by (L) » 1 or 2 step closure/opening identificated by (1S or 2S) » Multistep closure/opening On request: » driven by pneumatic solenoid valves (P) » pressure reducing identificated by (RID) » differential identificated by (D) » calibrated flange identificated by (FT) » special execution for LPG.
2SLR version
Automatic valve type 2SLR is regulated through two solenoid valves by a electronic counter (or by a mechanical counter with electrical micro-switches for preset functionality). When solenoids valve (NO) and (NC) are both de-energised all flow is diverted to the upper part of the diaphragm causing rapid closing of the seal. When both solenoids are energised, the valve is completely opened. The maximum opening can be governed by the pressure reducing valve screw (9). When solenoid valve (NO) is de-energised, and (NC) is energised the valve automatically reduces its flow to the low flow value can be regoulated by a stem valve (7). Control valve (3) allows for changes in velocity to switch from high rate to low rate flow. A strainer (2) filters product before it enters pilot circuits.
*“Isoseal” valves double seal for “fiscal” interceptions
Operation The ISOSEAL double seal valve for “fiscal” control, is made by an external body with flanged connections and by an internal spherical shutter. While closing, the shutter causes a pressure on two parabolic/cylindrical shape seal rings guaranteeing a progressive deceleration of the fluid up to the his complete interception. The special seal rings, are made of: • Teflon for floating ball valve • Stainless steel with Viton O-Ring for Trunnion valves.
They are made by two ball valves positioned in the upper and lower part of the ISOSEAL valve body (see drawing). The upper control valve allows also to insert a blade, in order to be sure and show that the ISOSEAL valve is closed. The lower control valve allows to verify the efficiency of the seal rings and the bleed operation The red rectangular flag indicates the main shaft rotation, showing the right position of the valve (open or close). In addition to that, the ISOSEAL is provided with a sealing device to lock the valve in closing position.
Features
The main characteristics of the double seal valve for “fiscal control”, are: • perfect seal • minimum friction between shutter and seat, avoiding the blocking problems • stem seal maintenance free • lubrication free • easy and quick handling • thanks to the perfect surfaces finishing and the particular seats profile a very good reliability is guaranteed, allowing to compensate automatically possible weariness.
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