CVS Controls 630 HP Manuale di istruzioni - Pagina 2

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Vents

Spring-loaded constructions have a screened vent

assembly (Key 24) installed in the ¼" NPT spring

case vent opening. If a remote vent is required,

remove the vent assembly and install a remote vent

line.

Pressure loaded constructions have a bleed orifice

fitting (Key 38) installed in an extra outlet connection

of the loading regulator. The function of this fitting is

to bleed loading pressure during operation of the

regulator or relief valve.

Warning: The bleed orifice fitting

continuously vents a small amount of gas. If

the regulator or relief valve is located where

accumulation of the vented gas will create

an explosion hazard, install a remote vent

line to carry the vented gas to a safe area.

The bleed orifice is furnished with a ¼" NPT

screened opening; remove the screen and

install remote vent line.

All remote vent lines must have as large an inside

diameter as possible. The vent line should be as

short as possible with a minimum number of bends

and elbows. Protect all vent openings against

entrance of rain, snow or any other foreign material

that may plug the vent or affect operation of the

regulator or relief valve. Inspect all vent openings

periodically to be sure they are not plugged.

Overpressure Protection

As is the case with most regulators, the Type 630 HP

spring-loaded and pressure-loaded regulators have

outlet pressure ratings that are lower than the inlet

pressure ratings. Overpressure protection must be

provided if the actual inlet pressure can exceed the

outlet pressure rating. Overpressure protection may

also be required for the loading regulator and main

regulator spring case of pressure loaded regulators

and relief valves.

Table 1: Maximum Inlet Pressures and Pressure Drops for CVS Type 630 HP Regulators

Max. Allowable

Inlet Pressure, (PSIG)

Max. Allowable

Pressure Drop,

(PSIG)

Does not apply to loading regulator of pressure-loaded Type 630 HP.

+ Inlet pressure must not exceed the sum of the actual outlet pressure setting and the maximum allowable pressure drop. For example, with an outlet

pressure setting of 200 psig and a 3/8" port dia. (maximum allowable pressure drop of 500 psig), the maximum allowable inlet pressure is 700 psig.

++ Nitrile valve discs are normally furnished for pressure drops to 200 psi. For better erosion resistance, nylon valve discs are normally furnished for

higher-pressure drops.

Some erosion of valve discs occurs at all pressure drops due to solid particles in the flow stream. The rate of erosion is higher with large amounts of

impurities in the flow stream and with higher pressure drops. Valve discs and other regulator parts must be inspected periodically for erosion and

damage and must be replaced as necessary.

1/8" & 3/16"

1/4" Port

Port Diameter

Diameter

1500

1000

Refer to the following tables to determine pressure

ratings:

1. Spring loaded Type 630 HP regulators

1.1. Inlet pressure and pressure drop (Table 1)

1.2. Outlet pressure (Table 2)

2. Pressure loaded Type 630 HP regulators

2.1. Main regulator inlet pressure and pressure

drop (Table 1)

2.2. Loading pressure and outlet pressure

(Table 3)

3. Spring loaded Type 630R relief valve pressure

(Table 4)

4. Pressure loaded Type 630R relief valve

pressures (Table 5)

WARNING: Over pressuring any portion of this

equipment may cause damage to regular parts,

leaks in the regulator or personal injury due to

bursting of pressure-containing parts or

explosion of accumulated gas.

To prevent overpressure, provide an appropriate

overpressure protection device to ensure that none

of the limits listed in tables 1 through 5 will be

exceeded.

Regulator or relief valve operation below the limits

specified in tables 1 through 5 does not preclude the

possibility of damage from external sources or from

debris in the gas line. Inspect the regulator for

damage following any over pressuring condition.

Loading Regulator Supply Pressure

Use a clean, dry gas as supply pressure for the

loading regulator of pressure loaded regulators or

relief valves. Connect the supply to the ¼" NPT inlet

connection of the loading regulator. The supply

pressure may be obtained from the upstream piping,

but be certain adequate overpressure protection is

provided for the loading regulator and for the spring

case of the main regulator or relief valve.

3/8" Port

Diameter

1000

500

1/2" Port

Diameter

750

250