120 GAS PRESSURE REGULATORS - DIRECT ACTING

WITH INCORPORATED SAFETYSHUT OFF DEVICE TYPE: 127-BV

shut-off device: - for high pressure -VP - for high and low pressure - VNP

LOW GAS PRESSURE REGULATOR

COMPANY FOR GAS EQUIPMENT, GENERAL ENGINEERING AND TRADINGI n dj i j a - S E R B I A

22320 IN\IJA, Kralja Petra I b.b.Tel./fax +381 22 561-630, 555-132, 510-064e-mail: office@gasteh.com; www.gasteh.com

TECHNICAL MANUAL

series

INTRODUCTION

Pressure regulator type: 127-BV is direct action device for low pressure, which ensure a constant

downstream pressure (p ). The regulator is controlled by a diaphragm and spring. They can be provided2

with shut-off device for low and high pressure or for high pressure. They can be used with natural gas,

LPG, air, nitrogen, etc.

Picture 1.Type: 127-BV

MAIN FEATURES

- Design pressure (PS): 19 bar

- Ambient temperature: -20ºC ÷ +60 ºC

- Max inlet pressure: 12 bar

- Range outlet pressure: 0,01 ÷ 1 bar

- Nominal size: DN40, DN50, DN65, DN80, DN100

- Nominal pressure: PN16, ANSI 150

- Connections according to EN 1092-1, EN 1759-1

- Face to face dimensions according to EN 334

- Available nozzle diametar (mm): see table 2

- With relief valve: p = (p +30 mbar ±10%), where open 2

are: p – relief valve opening pressure, p – outlet pressureopen 2

- Regulating charateristics:

GT-127-01

Table 1.

40 10 200,01÷0,2

0,2÷1,0

DN AC SGp2

(bar)

÷100 5 10

0,04÷1,0

0,008÷0,02

VP

AGpbl

(bar)

30

10

0,02÷0,05NP

10

REGULATOR OPERATION

Pressure regulator type: 127 initially (when there is no gas in the pipeline) is in the open position, i.e. the force

of the spring (1) through the diaphragm pulls the steam (2) with the ca (3) to the open position. When gas is

introduced into the installation, pressure acts on the lower surface of the diaphragm (4) and overpowers the

spring force, closing the regulator until the outlet line pressure p and the set-point outlet pressure are equalised.2

As the pressure p rises above the set-point, the force below the diaphragm increases, overpowering the spring2

force and closing the regulator. The increase in pressure p by the closing time is expressed as a percentage by2

the closing unit (SG). Pressure drop in the outlet line (i.e. further gas consumption) leads to the regulator

re-opening and performing its primary function - maintenance of a constant outlet pressure (p ) within the2

tolerance limits, represented as a percentage - by the regulator unit (AC). The force of the spring (1) is

determined by the spring tensioner (5). This type of the regulator integrates a balance diaphragm (6), which

ensures better regulation and considerably higher flow. (see picture 3.)

GT-127-01

SHUT-OFF DEVICE FOR REGULATORS SIZE DN40 ÷ DN80

18 10 17 10 18 17 18 10 17

An increase in pressure to the limit pressure value for stopping the operation (the pressure at which the shut-offdevice is activated) leads to the upward movement of the shut-off mechanism diaphragm assembly, whichpulls the lever (7) and activates the lock cog (8), releasing the bush (9) and, at the same time, the pin/spindle(10), which, subject to the force of the load spring of the shut-off (11), pushes the head (12) to the seat. Whenthe shut-off valve is activated as a result of overpressure, the diaphragm assembly overpowers the force of theVP spring (13), which is determined by the VP spring tensioner (14). The shut-off mechanism is activated(as a result of outlet under-pressure) by the force of the NP spring (15) pushing the diaphragm assemblydownwards, which then activates the lock cog through the lever (7) and releases the bush, i.e. unlocks theshut-off mechanism. The force of the NP spring (15) is determined by the NP spring tensioner (16). (see pic.4.)

Unlocking of shut-off device (picture 2.):Remove the manual puller (17) from the lower casing of the shut-off (18). Turn the manual puller and screw itonto the pin/spindle (10). Slowly pull the manual puller just to allow the gas to flow through the shut-off headand keep it in the same position for a few seconds until the pressures equalise, then pull the manual pullerall the way through and release it. A properly functioning shut-off mechanism will stay in the locked position.Unscrew the manual puller from the pin/spindle and re-screw it into the lower casing of the shut-off.

SHUT-OFF DEVICE FOR REGULATOR SIZE DN100

The impulse line takes the outlet pressure gas p to the shut-off mechanism pilot, which is an actuator of the 2

shut-off mechanism The pressure increase from p do p increases the force acting on the diaphragm (a) of the 2 blv

shut-off mechanism pilot and releases the high pressure spring (b), which results in axial movement of the pilot lock stem (c), which turns the key of the shut-off mechanism (e) by a puller (d). By turning the key, the space for the lock ball is provided (f) and the stem (g) forced by the spring pushes the lock head (h) against the seat stops the gas flow.A pressure drop from p to p decreases the force that acts on the pilot diaphragm of the shut-off mechanism, causing the low pressure spring (i) to move the pilot lock stem, which activates the shut-off mechanism as in the previous case.

Unblocking of shut-off device (mechanism):

Protection against high and low pressure:

Close the globe valve at the outlet of the regulation line.Turn the handwheel (clockwise) and equalise the pressure and then continue to turn the handwheel in order to unlock the mechanism.- Gradually open the globe valve at the outlet of the regulation line. (see picture 5.)

Picture 2.

A-A

membraneassembly

shut-of f device

impulse pipe V

SHUT-OFF DEVICE FOR SIZE DN40 ÷ DN80

5

1

4

6

2

3

membraneassembly

11

18

10

12

17 10 8 7 5 4 3 213 14 9 8 15 167

P2

p1p2

B-B B-B

C-CC

C

B

B

SHUT-OFF DEVICE FOR SIZE DN100

varijant I

Pilot SSD 2a2c

i2d

2e

2f

2g 2h

2b

to~ak

varijant II

Picture 3.Gas pressure regulator type: 127-BV

Picture 4.Shut-off device

Picture 5.Shut-off device

GT-127-01

410041004100390035003400

510051005100480045004400

460046004400410040003900

650065006500620060005800

525052505250600061006100

650065006500710073007700

650065006500680072007600

650065006500710082009900

650065006500710079009300

------------

6500650065007100820010000

GAS PRESSURE REGULATOR TYPE: 127-BVFLOW TABLE

Outlet pressure

p 2

Inlet pressure

p 1

DN40 DN50 DN65

ØD(mm)

ØD(mm)

mbarbarmbar

200

400

600

205010020501002002050100200400205010020040050020501002004005002050100200400500205010020040050020501002004005002050100200400500

310230170410360320280560560540490390750750750690530510930930930930930890110011001100125011001050110011001100125014301600

250230195365355335285480480460450370580580580570535515875875875875875865100011651165116511651165110013001450170017001700172017201720196022702320172017201720196022702400

ØD(mm)

510320230680590410320950810720620430112011201020980960940145014501400128011501020172017201720163014101280172017201720196021002100172017201720196022702750172017201720196022702700

6154602958858007004301220115010708005901450145013801030880850172017201720161012601185172017201720196016051530172017201720196022702750

815605405118010609205851660155014201070800194019401820140011701040260026002600242021501800260026002600290026002400260026002600310036004050260026002600310036004400260026002600310036004400

90081061012501250115075020002000170015201250245024502100190015001400260026002600250024002300260026002600310030002800260026002600310036004400

------------

990920770144014001330113024002400210018001550280028002650230018001700315031503150290028002650395039503950395038003600395039503950410046004900395039503950425048005600395039503950445052006350

13651185990207019501710130528002700240021001700347034003100280021002000395039503700340033003100395039503950430046004800395039503950445050505400

1

2

3

4

7

10

20018715829528527523039539038037031047047047046543541071071071071071070094094094094094094099011001100119011901190110011001100125014301650110011001100125014501700

42 31 42 53 53 65 65 8231

------------

------------

------------

DN80

ØD(mm)

82

DN100

ØD(mm)

102

162014151280

175015001350

2510225019001620

2750260023002000

37003700330031002800

45004500450041003800

------

6500650065007100820010000

2050100200400500

172017201720196022702400

172017201720196022702700

260026002600310036004400

-------

395039503950445052006350

12

110011001100125014501700

-------

-------

-------

Table 2.

GT-127-01

GT-127-01

Picture 6.Dimension

Table 4.

OVERALL DIMENSION

type: 127-BV

DIMENSION

B C DA

200230290

510520525

9595120

350350350

DNmeasure

405065

310 660 125 46580350 820 165 630100

GASspecificdensity (d)

corectionfactor (f)

airnitrogenpropanebutanenat. gas

CO2

10.971.572.090.61.52

0.770.7860.620.531

0.63

For other gases with differnt densities, the flow rate must be multipied by the correction factor f = √0,6/ d .

where ρ is gas density at temperature t = 0 °C and pressure p = 1,01325 bar.G

For usual used gases correction factor is shown in folowing table 7.

Table 5.