DESCRIPTION:
The S24 regulators are a new line of pressure regulators – piloted action type – designed to guarantee a high regulation accuracy and an utmost easiness in use. These devices are usually used in regulating stations & skids for civil and industrial uses in canalised network for natural gas, manufactured gas, LPG or other non-corrosive, preliminarily treated stable gases. The S24 pressure regulators are “fail to close” type, which means that in case of malfunction due to breaking of the main diaphragm or as a result of a lack of impulse downstream, the regulator will be closed completely. The S24 pressure regu- lators are “top entry” type, which allows for maintenance operations without having to remove the body from the pipes. Modularity allows for variation in its configuration even when already installed in stream. In addition, the modules can be easily disassembled for eventual controls.
Available version:
VERSIONS |
CONNECTIONS AND INTERAXIS (mm)* | CG (VALVE COEFFICIENT) | INLET PRESSURE
(bar) |
OUTLET PRESSURE
(bar) |
PILOT TYPE |
S24-1 | DN25 – 183* | 524 |
0,5 ÷ 20 |
0,01 ÷ 6 |
P1000 BP/MP |
S24-2 | DN40 – 223* | 1049 | |||
S24-3 | DN50 – 254* | 2250 |
0,01 ÷ 20 |
P1000 BP/MP P2000 AP |
|
S24-4 | DN80 – 298* | 4950 |
* INTERAXIS AS PER DIMENSIONS H IN FIG.A & B OF PARAGRAPH 7.1 AVAILABLE VERSIONS:
• B: WITH OPSO/UPSO SHUT-OFF VALVE
• M: WITH ACTIVE-MONITOR CONFIGURATION
• X: WITH ACTIVE-MONITOR AND OPSO/UPSO SHUT OFF VALVE
Materials:
- Body in cast iron (EN-GJS 400-18U LT)
- Covers in steel (ASTM A 350 LF2) or pressed steel (P275NH EN10028-3)
- Diaphragms in rubber with cloth enforcement
- Seats in stainless steel
Features:
- Counterbalanced regulating device
- Silenced version available
- Top entry construction
- In accordance to 2014/68/UE – EN334
- Working Temperature: -20°C÷ 80°C
- Regulating Class (AC): up to 1
- Closing Pressure Class (SG): up to 5
Dimension:
The choice of the regulator is made using the Cg valve coefficient.
Cg coefficient is numerically equivalent to the value of airflow in Stm3/h in critical conditions with full open regulator operating with an upstream pressure of 1 psi and a temperature of 15° C.
Flow rates with maximum operating at different operating conditions can be calculated as follows:
a. in non-critical conditions (when Pa < 0,29 Pe)
b. in critical conditions (when Pa ≥ 0,29 Pe)
Where:
Q = capacity [Stm3/h]
Pe= absolute upstream pressure [bar] Pa= absolute downstream pressure [bar]
OPERATING PRINCIPLE
The S24 pressure regulator is a piloted-action type device in which the mobile shutter (1) is kept into the closed position by the action of the spring (2), in absence of motorization.
The shutter (1) is completely balanced because appropriate holes (A) and ducts (B) carry the upstream pressure both in the upper part of the shutter (1) and in the chamber (C) to balance the stem.
All the movable element, is therefore perfectly balanced for whose variations in upstream pressure, even of considerable size, do not result in variations of forces and thus do not alter the balance between the forces due to the pressure differ- ence between the chambers (D) of motorization , the chamber (E) connected downstream, the spring (2) and the weight of the group components.
The shutter movements are controlled by the diaphragm (3) on which the spring (2) acts downwards (towards the clos- ing direction of the shutter) and the motorization pressure of the chamber (D), fed by the pilot, acts upwards.
The pilot is a device that serves to feed the motorization chamber (D) by balancing the regulated pressure (Pd) in the chamber (E) and the spring load (2) as a function of the regulated pressure (Pd) and determining stroke variations of the shutter according to the flow rate to be delivered.
To perform this function, the pilot is fed with gas taken upstream (in high pressure), filtered and reduced in pressure by means of devices incorporated in the pilot itself (or separate). Thanks to these devices, the valve (4) of the pilot receives clean and regulated gas with a pressure of about 2 bar higher than the downstream one (Pd). The delivery flow rate of the pilot is regulated by the shutter (5), controlled through kinematics by the diaphragm (6). The regulated pressure (Pd) in the downstream chamber (F) and the pilot regulation spring (7) act on the diaphragm (6).
When the regulated pressure (Pd) reached the set value, the diaphragm (6) moves upwards determining a flow equilibri- um between the supply valves (4) and the orifice (G) which discharges downstream. This creates a balance between the motorization pressure in the chamber (D) and the opposing forces (pressure regulated in the chamber (E), spring (2) and weight of the moving parts). In these conditions, the regulating shutter (1) is positioned at a lift that determines the flow rate delivered.
Due to a decrease in flow rate, the regulated pressure (Pd) tends to increase causing the pilot diaphragm (6) to move upwards causing a throttling of the valve (4) causing a decrease in the motorization pressure and therefore a new gradual closing position of the shutter (1).
Due to an increase in flow rate, the regulated pressure (Pd) tends to decrease, causing the pilot diaphragm (6) to move downwards, causing the valve (4) to open, causing an increase in the motorization pressure and therefore a new gradual opening position of the shutter (1).
If the flow rate is reduced to zero, the pilot diaphragm (6) rises bringing the obturator (5) to complete closure thus caus- ing a decrease in the motorization pressure until the obturator (1) closes completely and therefore the seal of the regula- tor.
If the regulated pressure (Pd) should suddenly increase due to a very rapid (and therefore anomalous) flow rate decrease, the diaphragm (6) rises bringing the shutter (5) to complete closure and, overcoming the action of the spring (8), caus- ing the opening of the valve (9) (built-in accelerator) which quickly discharges the motorization chamber (D) bringing the shutter (1) to quick closing.
a. Regulator installation diagram
b. Regulator & monitor installation diagram
Overall Dimension:
Installation s23:
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