Page 174 - publication

gruvlok installation and assembly

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174

Venturi C

v

Performance Curve s

CAUTION:

Hot water leakage can occur from

metering ports (P.M.P.’s) during probe insertion

and hookup of metering device. Wear protective

eyewear and clothing to prevent personal injury

when measuring pressure.

Fig. 5:

GBV setting of

5.0 indicates that the

valve is fully opened.

In some cases, the valve

may open as much as 5.3

turns, due to the depth

of the stem threads. This is

not a problem with the valve;

however, the performance

curves for these GBVs are

calibrated only to 5.0 turns.

12

Connect pressure measuring device to

the GBV metering ports as follows:

• Remove protective cap from metering ports

(

1

/

4

" NPT connection).

• Insert the meter probe into the metering

ports. The hose with orange ftting,

up stream; the hose with blue ftting

downstream.

CAUTION:

When inserting probe, do not bend, as this will

cause permanent damage to the probe, adversely

affecting the pressure measurement. Do not use

any lubrication on the probes when inserting them.

If necessary, simply wet the probes with clean

water.

The probe should not be left inserted into the

ftting for prolonged periods of time, overnight,

etc., as leakage of the P.M.P. may occur when the

probe is removed.

The locking nut on the probe is designed to hold it

in the P.M.P. when taking readings. As sealing is

accomplished internally on the probe stem, it is

only necessary to tighten the locking nut FINGER-

TIGHT. Over-tightening may cause damage to the

P.M.P. or locking nut threads.

13

Before taking a measurement reading,

set the valve to its fully open position

(5.0) or at a preset position. Read the pressure

drop across the venturi with a digital meter.

Determine fow rate by use of venturi Cv

performance curves on page 4 or the Anvil

Balancing Slide Rule.

14

The handle of the GBV is not designed

to be removable. Do not try to take

it off the valve, or it may become damaged. If

for any reason, the handle is damaged, replace

the entire handle/stem assembly with the

appropriate replacement part indicated in the

table below.

MEMORY SETTING:

15

After valve has been properly adjusted

and without moving the handwheel,

the locking memory stop should be set. The

memory stop will allow the valve to be fully

closed for isolation and then reopened to the

preset fow position.

16

Insert a 2.5 mm (or

3

/

32

") Allen key

through the hole provided in the valve’s

handle cap. (Fig. 6)

17

Turn the setscrew in a clockwise

direction until it stops. It is not

necessary to tighten. The memory has now

been set. This establishes the maximum opening

position for this particular valve.

18

The valve may now be closed tightly,

as needed, for isolating the piping

during system maintenance. To return the valve

to its preset “balanced” position, simply open

the valve by turning the handwheel counter-

clockwise until the handle stops turning (the

valve stem inside the handle has hit the memory

setscrew).

DO NOT APPLY EXCESSIVE FORCE

WHEN REOPENING THE VALVE – OPEN ONLY

UNTIL THE VALVE STOPS TURNING UNDER

“HAND TIGHT” CONDITIONS. DO NOT USE

A WRENCH TO OPEN, CLOSE, OR TIGHTEN

VALVES.

See next page for Fig. 8 for both the GBV-S & GBV-T and a troubleshooting chart

Fig. 7:

These curves are for balancing contractors’ use when balancing an HVAC system.

For pressure drop vs. fow across the entire valve, please refer to Fig. 8.

FIG. GBV-S & GBV-T

Five Turn Circuit Balancing Valves

HANDWHEEL

LOCK NUT

SET SCREW

CAP

TURN

INDICATOR

STEM

High Pressure

Port (orange)

Low Pressure

Port (blue)

Fig. 6

PART NUMBER

SIZE

871158-010

1

/

2

"

871158-011

3

/

4

"

871158-012

1"

871158-013

1

/

4

"

871158-014

1

/

2

"

871158-015

2"

GL-2.10