technical manual 127-bv -ce
TRANSCRIPT
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: [email protected]; 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.