Data Sheet

Bulletin 71.1:630

Figure 2. Type 630 Sectional Views

FULL SECTION

SPRING

CASE

DIAPHRAGM

CONNECTOR

DIAPHRAGM

ADAPTOR

VALVE DISK

AND HOLDER

ORIFICE

INLET ADAPTOR

W0428-3*

LEVER

BODY

W0429-3*

BODY ONLY

(ROTATED 90°)

REGISTRATION HOLE

[2-INCH / DN 50 SIZE ONLY]

PITOT TUBE

[1-INCH / DN 25 SIZE ONLY]

Figure 3. Type 630 Operational Schematic

A6673

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

Principle of Operations

Refer to Figure 2. In the regulator construction, outlet

pressure registers beneath the diaphragm. As long

as the outlet pressure is less than the set pressure,

spring force on the diaphragm causes the lever to hold

the valve open. When the outlet pressure exceeds the

set pressure, the diaphragm moves to compress the

spring and the lever closes the valve until the outlet

pressure returns to set pressure.

Capacity Data

Flow capacities are given in Tables 3 and 4 in standard

cubic feet per hour (SCFH) and normal cubic meters

per hour (Nm

/h)of0.6specicgravitynatural

gas.Todeterminetheequivalentowrateforother

gases, multiply the table value by the appropriate

factor: air—0.775; butane—0.547; nitrogen—0.789;

propane—0.627.