Pressure sustaining and relief valve type E2116-00

Pressure sustaining and relief valve type E2116-00

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Main features

Choice of the valve

The pressure sustaining/relief valve E2116-00 is controlled by a normally closed diaphragm actuated, two way, spring loaded, adjustable pressure discharging control valve (rep 1), set to maintain a minimum and constant pressure at valve inlet.

When upstream pressure increases to the sustaining/relief set point, the control pilot (rep1) throttles towards open, increasing flow through the pilot circuit; pressure is decreased in the main valve control chamber, inducing the main valve to modulate towards open an appropriate amount, relieving excess upstream pressure through the main valve to its outlet. The opening speed can be adjusted by independent flow regulator “OPENING SPEED = OS” located in lockable central control “TUP - 93” rep7).

As the upstream pressure decreases to the sustaining/relief set point, the control pilot (rep1) throttles towards closed, restricting the flow through the pilot circuit. Pressure is increased in the main valve control chamber, inducing the main valve to modulate towards closed an appropriate amount, maintaining the desired upstream pressure. The closing speed can be adjusted by the independent flow regulator “CLOSING SPEED = CS” located in the lockable central control “TUP-93”.

If upstream pressure is dropping below the sustaining/relief set point and is remaining below the set point, the main valve is closing drop-tight.

Hydraulic scheme

Item

Description

Material

1

Pressure sustaining \ relief pilot

2

Tube

AISI 304

3a 3b 3c

Ball valve

Brass Ni-plated

4

Main valve

5

Position indicator with manual venting cock.

6d

Gauge holder ball valve ( manometer)

Brass Ni-plated

7

Centralized control unit

References (standard version with adjustment range 1,4-14 bar)

Other adjustment ranges are available: 0,1-2 bar and 7-21 bar (please consult us).

Material and coating

Item

Quantity

Description

Material

01

01

Body

FGS 400-15 (coating BFE epoxy 250μm mini)

02

01

Cover

FGS 400-15 (coating BFE epoxy 250μm mini)

03

01

Cover bearing

Bronze

04

01

Seat

AISI 316

05

01

Quad-ring retainer plate

AISI 316

06

01

Quad-ring retainer size 50-200

Quad-ring retainer size 250-700

AISI 316

FGS 500-15 + Epoxy

07

01

Stem

AISI 303

08

02

Stem nuts

AISI 303

09

01

Spacer

AISI 303

10

02

Diaphragm washers epoxy coated

Steel

11

01

Spring

AISI 302

12

*

Stud

AISI 303

13

*

Nut

AISI 303

14

*

Washer

AISI 303

15

01

Quad-ring

NBR (KTW-WRC)

16

01

Seat O-ring

Viton

17

01

Diaphragm

NBR nylon reinforced (KTW-WRC)

18

01

O-ring

NBR

19

02

Centring taper pin

AISI 303

20

01

Base position indicator

Brass Ni-plated

21

01

Position indicator housing

Brass Ni-plated

22

01

Position indicator stem

AISI 303

23

01

Position indicator

Glass

24

02

O-ring

NBR

25

01

Brass Ni-plated

Brass Ni-plated

26

01

O-ring

NBR

27

01

Reduction

AISI 304

Pressure sustaining / Relief pilot range

In order to get the best accuracy from the pressure sustaining valve operation, the preset values for the minimum upstream pressure should be included in the indicated range of the pilot valves. If it is very near to the extreme limits of the range, it would then be advisable to replace the spring by the correct one.

Available rangesPilot PV 20CApproximate correction in bar/turn

0.1-2

Oui

0.3

1.4-12

Oui

2.0
7-21Oui3.0

The standard range is 1.4-12.

Limit conditions

Cavitation diagram: it’s the admissible differential pressure normally used in the regulating valve

P1 = Maximum inlet pressure of the valve

P2 = Minimum outlet pressure before danger of cavitation occurs

Green area: no danger of cavitation (and therefore no significant wear on the valve)

Red area: notable danger of cavitation (with accelerate wear and damage of the valve)

Central Control Unit TUP 93

Item

Quantity

Description

Material (type)

01

01

Body

AISI 303

02

03

Cock

AISI 303

03

03

Plug

AISI 303

04

03

O-ring

NBR

05

02

Non return valve (WRC)

06

01

Screen

AISI 316

07

01

Rivet

Brass

08

01

Bottom label

Polycarbonate makrolon

09

01

Top label

Polycarbonate makrolon

Pilot PV 20 c

Item

Description

Material

1

Pilot cover

Bronze

2

Top spring guide

Bronze

3

Obturator / stem

Brass

4

Top diaphragm washer

Brass Ni-plated

5

Diaphragm

NBR nylon reinforced

6

Spacer

Brass Ni-plated

7

Seat gasket

NBR

8

Body

Bronze

9

Seat

AISI 316

10

Seat retainer

Brass

11

Bottom diaphragm washer

Brass Ni-plated

12

Spring

AISI 302

13

Setting screw

AISI 303

Mounting scheme (I)

Item

Quantity

Description

01

2

Attachment flange

02

2

Flanged taper

03

3

Isolating valve

04

1

Strainer with drain cock

05

1

Automatic control valve E2001

06

1

Dismantling joint

07

1

Air release / vacuum breaker valve

Mounting scheme (II)

Item

Quantity

Description

01

2

Attachment flange

02

2

Flanged taper

03

3

Isolating valve

04

1

Strainer with drain cock

05

1

Automatic control valve E2001

06

1

Dismantling joint

07

1

Air release / vacuum breaker valve

081Security valve

Installation

Packing and storage

The valves are packed in special cardboard boxes. Outside the carton are clearly pointed out:

  • The arrow indicating the position of the valve
  • The name of the customer
  • The code of the valve
  • The number of order confirmation

The valve is protected by two hardening foam cushions, carefully coated by a thermal plate.

This kind of packing if properly stored avoids all the damages originated from transport, unloading, and handling before installation. Avoid storing it under the rain for more than 24 hours!

Open the upper side of the carton and remove the upper cushion. Do not lift the valve by utilizing the pilot, the pilot circuit, or the position indicator.

For any kind of handling we recommend to utilize proper eyebolts.

Installation

The mounting scheme of the valve is shown on the drawing.

If the valve is working as pressure sustaining device in a transport line, it may be recommended to install a by-pass around it, which will allow to put it out of service during some hours for maintenance purpose, without generating problem for the exploitation of the system.

The choice of the proper "by-pass" alternative must be taken considering the following points:

  • a- Can the main transport/feeding line be put out of service during some hours (corresponding to the requested time for maintaining the MAIN VALVE), without generating problem for the exploitation of the system? In particular, it must be considered that an empty system may require several hours to be vented properly.
  • b- Pressure relief: Has the downstream or upstream zone of the system to be protected against any risk of pressure surge (quick closing of heavy demands, closing time) ?

Should installation require the main valve stem to be horizontal (cover pointed sideways), manufacturer should be consulted concerning valves of DN200 mm and larger.

Note: All sizes on request are available with an additional venting cover device ( venting cock installed at the top of the cover ) to permit a simple escaping of air during the first commissioning.

  • Before control valve assembly, make sure that pipeline it is free from foreign matters or any other obstacle. (note: pipeline must be cleaned, possibly, before assembly. For an ideal pipeline cleaning we suggest a 1.5 m/sec speed during several hours!).
  • In presence of foreign matters into the fluid it is indispensable to adopt a strainer on valve upstream side.
  • Keep free around the valve space enough for operations as maintenance and calibration.
  • Set up the valve according to main valve cast arrow indicating flow sense.
  • Install the valve so that the FLOW ARROW marked on the valve body matches flow through the line: UPSTREAM → DOWNSTREAM

Start up of an automatic control valve requires that proper procedures be followed. Time must be allowed for the valve to react to adjustments and the system to stabilize. The objective of the following procedure is to bring the valve into service in a controlled manner.

Commissioning

Close upstream and downstream (if existing) isolation valve.

Open all ball cocks (3 a and b) of the pilot circuit. Failure to open these ones will prevent the valve from functioning properly. Ball valve 3 C must be closed.

TUP - 93 (rep 7) pre-setting:

  • a- Reaction speed [RS] is already setting = 3
  • b- Opening speed [OS] is already setting = 6
  • c- Closing speed [CS] is already setting = 2

Calibrate setting screws "OPENING" and "CLOSING" according to the practical service conditions (see below). If not included in the order, install one pressure gauge by utilising the gauge holder ball valve (6 d).

Initial set up:

  • On pressure sustaining/relief control (rep 1), loose the counter-nut and turn the setting screw clockwise (IN), until the screw is practically compressing the spring at its maximum. This is simulating the highest setting value of the spring range, from which the commissioner will have to gradually decrease the pressure, up to the prescribed one.
  • Check the setting of the TUP - 93, as indicated above.
  • Open upstream isolation valve SLOWLY of one / two turns maximum, in order to allow a controlled filling of the regulating valve, which is going to close [ in any case, if the maximum set value of control (1) is higher than the upstream pressure of the system].
  • Vent air of main valve cover through the safety venting cock mounted on the valve position indicator (5).
  • Check the upstream pressure gauge, which should show a pressure value corresponding to the system pressure. To open partially the inlet and outlet isolating valve, and completely the ball valve 3c. Then to turn progressively by ½ turn the regulating screw of control (1) anti-clockwise (OUT), to decrease the set maximum pressure. Wait some seconds (5 - 10 s) after each (1/2 turn) correction, allowing to the pilot circuit to react. Sustaining valve: As soon as the flow starts in the pilot circuit (WHISTLE of water), observe the upstream gauge and unscrew further and very slowly the regulating screw of control (1). The main valve (rep 4) opens, releasing the inlet pressure to its outlet; wait until the main valve is stable and read the set pressure. Unscrew further the regulating screw of control (rep 1), until the inlet pressure is reaching the prescribed value. SUSTAINING VALVE Fine tune the pressure sustaining pilot (1) to the set point: SCREW CLOCKWISE (IN) → increase inlet pressure - SCREW ANTI-CLOCK (OUT) →decrease inlet pressure Relief valve As soon as the flow starts in the pilot circuit (WHISTLE of water), screw clockwise (IN) the regulating screw of the control (rep 1), in order to set the pressure relief value at higher value than the one of the system [system pressure + prescribed overpressure, which can be computed by using the data given here above]. Example: Pressure relief valve mounted on a pumping transport line (pump in service) / control (1) has a standard range of 1.4 - 14 bar: a) dynamic pressure P1 of the system starts to open the pilot (1) b) overpressure chosen = 1 bar, requesting to screw clockwise the regulating screw of pilot (1) of half-turn -----> relief pressure value is now set to [P1 + 1 bar]
  • When the desired setting is reached, open completely, but slowly, the upstream isolation valve.
  • Then lock the counter-nut of pilot (1) and the plastic cap.
  • “TUP - 93” adjusting closing speed: the closing speed adjustment reduces the flow entering in the main valve (4) control chamber. Do not reduce this value below 1 to assure a correct closing of the valve. “TUP - 93” adjusting opening speed: the opening speed adjustment reduces the flow in exit from the main valve (4) control chamber. If the opening speed of the valve is too fast [pre-setting of the flow regulator (OS) at value = 6] decrease the adjustment of the regulator progressively towards 3. In the opposite case to increase the value but without going below value 1 to assure a correct opening of the valve.

Maintenance

Recommended spare parts:

  • 1 pilot PV20C
  • Set of joints for PV20C
  • Set of joint for E2001

The quality of the material used in the manufacture of our valves should produce no wear of the internal components.

However we are recommending:

After 6 months of service :

  • Control and clean eventually the TUP - 93 screen Note: an obstructed screen due progressively the valve out of order.

After 12/18 months of service :

  • Control and clean the TUP - 93screen.
  • Take the main valve apart, by removing first the complete pilot circuit.
  • Unscrew the stud nuts and remove the cover and internal diaphragm assembly.
  • Check for any eventual damage of the QUAD-RING and the diaphragm.
  • Clean thoroughly the internal part of the valve, grease slightly the stem at both guided locations (water grease, non-toxic!!).
  • Assemble the main valve and the pilot circuit.
  • Put the valve back into service.

This control should then allow to determine the cycle of the requested maintenance, since it is taking into consideration the true service conditions of the valve.

For any further information contact our Customer Service, indicating all data as per plastic label on main valve body. Give full detailed information’s about working conditions, the type of problem, and report the adjusting values (OS-CS-RS).