MODELGS
OVAL TURBO STEAM METER
GENERAL CATALOGThe OVAL TURBO STEAM METER has been used as
an effective instrument for the measurement of steam
for more than twenty-five years.
In response to market needs for more modern energy
management, we new brought out an entirely newmodel. This new model accomplishes easy accurate
measurement a hundred percent of the time.

1. Wide flow range and high accuracy.
2. Greatly extended service life (morethan three times that of previouslyoffered model).
3. Minimized pressure loss. Energy
loss substantially reduced.
4. Very simple installation procedure−no pipe taps required.
5. Can readily change range orifices
without removing meter from pipeline.

FEATURES

6. Manual pressure adjusting device isstandard, and Automatic Pressure
Compensator (APC) is optionallyavailable for readout.
7. Easy-to-read total count register
which combines a pointer-and-dialand counter drums. Remote totalization also possible.
8. Vertical-mount and horezontalmount types are available. (A horizontal-mount version only for
theMINI Type)AUTOMATIC PRESSURE COMPENSATION VERSIONMETER BODY
Comes in two types−for verticalpiping and horizontal piping
application.
(In case of Mini Type, horizontal
mount only)

Range Orifice●●ROTORORIFICE COMPARTMENT

A shunt steam stream is directed
at the turbine rotor which give it
revolutions proportional to theflow rate.

●The flow range can be changed
easily just by replacing the range
orifice externally.
(In case of Mini Type, a throttle
nozzle is provided instead of arange orifice.)●

FILLER OPENING
Water fills the reducing chamber
containing the damping fanthrough this opening.

CAPILLARY TUBE

●Introducing line pressure to theAPC.

REDUCTION GEARCHAMBERContains the damping fan andreduction gear train; keeps heat
conduction to the register below
60℃ with radiator fins. Normally
immersed in water.

●●

AUTOMATIC PRESSURE
COMPENSATOR (APC)
Compensating the steam flow forline pressure automatically.
4compensating ranges are available depending on the operatingpressure.

MANUAL PRESSURE
ADJUSTMENT VERSION●●●●DIRECT-READINGREGISTER
Easy reading is obtained by atotalizing pointer and counter
drum combination.

ADJUSTMENTCOMPARTMENT
Removing the cap, pressure
setting and adjustment ofmeter error can simply beaccomplished.

2TERMINAL BOX
A contact closure pulse generator offers remote totalization.

the meter body. This shaft rotation istransmitted through a magnetic coupling to a computing gear train in theregister. Steam flow totals are provided by the direct reading dial andcounter in the register. A pulse generator can be located in the register toprovide for flow transmission to aremote totalizer.
High accuracy is assured by the useof anti-friction bearings throughout.
Hard carbon bearings are used at themeasuring rotor.Sapphires are used
for the lower shaft bearing. All parts
are designed to operate smoothly forlong periods at high temperatures.

The Turbo Steam Meter is comprisedof 4 major components: body withrange orifice, by-pass with rotor,
reduction gear chamber and direct
reading counter.
The total steam flow is divided in themain meter body and a proportional
flow passes through the nozzle andbypass. Smooth operation of the rotor
is assured by a direct coupleddampening fan operating in a pool ofa chamber below the turbine.
The damping torque of the submerged fan and the turning torque ofthe measuring rotor are balanced toproduce a shaft rotation speed proproportional to the total flow through

PRINCIPLE OF
OPERATIONLINE-UP●

STANDARD TYPE

"V" Type"H" Type"V" Type"H" Type

MANUAL PRESSURE
ADJUSTMENT VERSIONAUTOMATIC PRESSURE
COMPENSATION VERSION●MINI TYPE
●Specifications

Nominal size

Mini
GSM
25mm

Standard
GSH, GSV
50, 80, 100mm

Flow range

15〜200kg/h

79〜8751kg/h

Model(0.5MPa steam)Operatingtemp. range
Max. operatingpress.

Accuracy
Others

AUTOMATIC PRESSURECOMPENSATION VERSION

220゜C Max.
0.9 MPa±2% of RD
Pulse generator may beadded.

MANUAL PRESSURE
ADJUSTMENT VERSION※：For further details, see GS.No. GBG201-E and GBG202-E.

3

INSTALLATION
Install the meter on a horizontal orvertical straight pipe section. The
mini-mum length of straight pipe
sections required is 10 times the pipe
I.D. up-stream of,and 5 times the pipe

I.D. downstream of the meter. Be sureto fill the reduction gear chamber withclean water or antifreezing solution
before startups. Safeguard your meteragainst freezing in winter.

VERTICAL INSTALLATIONHORIZONTAL INSTALLATION
10・D Min.

5-DMin5・D Min.

D: Nominal Meter Bore

Counter

10-DMin

Note: The direction of the counter face canbe changed in 90 deg. steps asnecessary.

Direction of Flow

Direction of FlowCounter

D: NominalMeter BoreThe specification as of November, 2014 is stated in this catalog. Specifications and design are subject to change without notice.

http: //www.oval.co.jp/english
3-10-8 Kamiochiai, Shinjuku-ku, Tokyo 161-8508, JapanTel. 81-3-3360-5121 Fax. 81-3-3365-8605

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