Emerson EZH and EZHSO Series Pressure Reducing Regulators Ficha de datos descargar pdf (Pagina 10)

Bulletin 71.2:EZH and EZHSO

Noise Abatement Trim

Whisper Trim™ cage provides effective attenuation

of aerodynamic noise in gas applications involving high

pressure drop ratios. Aerodynamic noise is generated

by the turbulence created in the ow of gas as the uid

passes through the port. To achieve effective noise

attenuation, a Whisper Trim cage utilizes multiple

orices of special shape, size and spacing. These

orices break up turbulent uid streams, reducing

noise-producing interactions. EZH and EZHSO Series

with NPS 2 to 4 / DN 50 to 100 body sizes

offer an optional Whisper Trim Cage to reduce

noise by up to 8 dBA. See Figure 7 for Noise

Level Comparisons.

Slam-Shut Device

Principle of Operation

The slam-shut device on Types EZHOSX (Figure 6)

and EZHSO-OSX can provide either overpressure

(OPSO) or overpressure and underpressure (OPSO/

UPSO) protection by completely shutting off the ow

of gas to the downstream system. The slam shut

has a mechanism box and a manometric device.

The manometric device is composed of spring and

diaphragm actuator. Its movement activates the

detection stage of the mechanism box. The shutoff is a

two stage process, the detection stage and the power

stage. This separation between detection stage and

power stage provides maximum precision, alleviating

many false trips caused by environmental vibrations. The

slam-shut device includes a bypass valve that will allow

pressure to be equalized when resetting the device.

Once the slam-shut device has been tripped, it must

be manually reset.

Figure 6. Type EZHOSX Operational Schematic

EVENT

50 mm

35 mm

15 mm

COURSE CLAPET

MANOMETRIC DEVICE

MANOMETRIC DEVICE STEM

EQUALIZER BYPASS

VALVE PLUG

VALVE PLUG DISK

MECHANISM BOX

TYPE SA/2

TYPE PRX

E0939

INLET PRESSURE

LOADING PRESSURE

PILOT SUPPLY PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

CHECK VALVE

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 27 28

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