Anderson Greenwood - Pentair Series 400 Modulating Datasheet.pdf 1b6p1v

Pilot Operated Safety Relief Valves Series 400 - Modulating

ANDERSON GREENWOOD

The Series 400* modulating valve, with non-flowing pilot, incorporates an advanced design in pilot operated valves. Under process conditions, both pilot and main valve can be tight as high as 98 percent of set pressure. The main valve lifts proportionally, according to demand, restricting product loss to only that which must be relieved to prevent process pressure from exceeding the code allowance. The Series 400 valve is well suited for gas and/or liquid services, including dirty and/ or wet services. The modulating action is strongly preferred for liquid relief because it eliminates the destructive effects of ‘liquid hammer.’ The Series 400 valve is available with the following: effective orifice areas of 0.710 through 251.3 cm2 [0.110 through 38.96 inch2] valve inlet sizes 25 mm through 200 mm [1-inch through 8-inch], set pressure between1.03 and 102.0 barg [15 and 1480 psig ], and continuous service temperatures from -54°C to +260°C [ -65°F to +500°F].

Features and Benefits • Increased System Output Because of valve tightness to 98 percent of set pressure, the system can be operated nearer set pressure without valve leakage, resulting in greater system throughput. • Reduced Noise Modulating action minimizes flow and resultant noise during normal system upset, reducing noise abatement costs. • Reduced Product Loss and Pollution Soft seats for tightness before and after relief cycles. Modulating action relieves minimum product to prevent overpressure. • Rugged Bracket Pilot Mounting Extremely rigid mounting protecting against vibration and careless handling. Shake table proven. • Non-flowing Pilot Minimizes entrance of dirt and formation of hydrates in pilot. Due to low velocities within the pilot and supply tubing, most particles will drop out upstream of pilot inlet screen. Optional cartridge type pilot filter is available for extremely dirty services.

www.pentair.com/valves

• Balanced Design Proper valve operation and lift are unaffected by back pressure. Costly and fragile metal bellows are not required. • Unique Field Test Capability Allows accurate set pressure verification with valve in service. No system isolation valve or rupture disc required. All field test connections are provided with an indicator for accurate and easy set pressure testing. • Ease of Adjustment Single adjustment for set pressure allows accurate and dependable setting.

• Reduced Maintenance Costs Soft seats greatly extend service life, making costly and time-consuming metal seat lapping unnecessary. • ASME Section VIII Code Stamp Certified National Board capacities for both gas and liquid service assures of independent third party flow rate verification. • CE Mark 100 % compliance with European Pressure Equipment Directive n°97/23/‌EC. * Patent Protected

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AGCDR-0003-EN-1308

Pilot Operated Safety Relief Valves Series 400 - Modulating

Set

With no system pressure, the pilot inlet seat is open and the outlet seat is closed. As pressure is itted to the main valve inlet, it enters the pilot through a filter screen. Pressure is then transmitted through ages in the piston, past the inlet seat, into the main valve dome, which causes the main valve piston to remain closed.

Opening

Closing

Main Valve Piston Lift

Down Force on Main Valve Piston 0

Operation

100% Lift

95% Set Pres., Minimum

Set

Pressure

Pressure

Set Pressurre Adjustment Inlet Seal

Sense Diaphragm Main Valve Dome

Tubed to Main Valve Outlet Piston Piston

Outlet Seal

Below Set Pressure With Main Valve Closed

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page 2

As system pressure increases and approaches valve set pressure, it acts upward on the sense diaphragm, with the piston also moving upward to close the inlet seat. This seals in the main valve dome pressure, since the outlet seat is also closed. A small, further increase in system pressure opens the outlet seat, partially venting the main valve dome pressure. This reduced dome pressure acts on the unbalanced piston to reduce piston lift, tending to ‘lock in’ the dome pressure. Thus, at any stable inlet pressure, there will be no pilot flow (i.e., zero leakage). As inlet pressure rises above set pressure, dome pressure reduction will provide modulating action of the main valve piston proportional to the process upset. The spool/ piston combination will move, responding to system pressure, to alternately allow pressure in the main valve dome to increase or decrease. This moves the main valve piston to the exact lift that will keep system pressure constant at the required flow. Full main valve lift, and therefore full capacity, is achieved with relatively little overpressure. As system pressure decreases below set pressure, the piston moves downward and opens the inlet seat to it system pressure to the dome. This closes the main valve. The pilot exhaust is always piped to the main valve outlet.

Pilot Operated Safety Relief Valves Series 400 - Modulating

Specifications • Non-flowing pilot. • Single point set pressure adjustment. • Replaceable main valve seat, located on piston to take wear. • mechanism in pilot, independent of primary pressure sensing mechanism, to ensure smooth modulation of main valve. • Indicator button for field test capability. • Field replaceable main valve nozzle. • Lettered orifices meet API standard 526 dimension requirements. • Pilot fully balanced against back-pressures.

Tubed to Main Valve Outlet

At or Slightly Above Set Pressure Main Valve Partially Open and Modulating

Tubed Tubed to to Main Main Valve Outlet Valve Outlet

Above Set Pressure With Main Valve Fully Open

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page 3

Pilot Operated Safety Relief Valves Series 400 - Modulating Series 400 Pilot (Gas Service)

16 17

9

18

39

12

15 13

19

10 36

40 22

24

35

25

26

3

20.8 - 51.0 barg [301 - 740 psig]

39 6

10

9 43

38

13 12

26

44

20 and and 21

4 and and 42

39

40 35 22 24

14

25

41 23

51.1 - 102 barg [741 - 1480 psig]

8

7

Dome Dome

27

12

3

3

34 33 32

11

Notes

5 28

Series 400 Pilot

1

29

2

30

31

1.03 - 20.6 barg [15 - 300 psig]

1. 316 SS for set pressure range 1.03 – 4.48 barg [15 – 65 psig]. 2. 302 SS for set pressure range 34.5 – 102.1 barg [501 – 1480 psig]. 3. Viton® is a ed trademark of the E.I. duPont de Nemours Company.

Materials of Construction Item

Description

/S1, /S

/S1/NACE, /S/NACE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Body Body Plug Piston Sense Diaphragm Inlet Nozzle Spring Inlet Seat Spool Spring Piston Nut Sense Washer Bias Spring Piston Seal Spring Washer Diaphragm Case Spring Bonnet Adjustment Screw Jam Nut Cap Bonnet Vent Case Bolt Body Bolt Case/Liner Seal Bushing Piston Sleeve

A479-316 SS A479-316 SS A479-316 SS See Soft Goods A479-316 SS 17-7 SS1 See Soft Goods 302 SS 316 SS A479-316 SS 316 SS See Soft Goods A479-316 SS A479-316 SS A351-CF8M SS A276-316 SS A479-316 SS A582-303 SS Zytel® A193-B8M SS2 A193-B8M SS2 See Soft Goods A26-316 SS A479-316 SS

A479-316 SS A479-316 SS A479-316 SS See Soft Goods A479-316 SS 17-7 SS Viton® Elgiloy 316 SS 316 SS Elgiloy Viton® A479-316 SS A479-316 SS A351-CF8M SS A276-316 SS A479-316 SS A582-303 SS Zytel® A193-B8M SS2 A193-B8M SS2 Viton® A276-316 SS A479-316 SS

Pentair reserves the right to change the contents without notice

Item

Description

25 Sleeve/Case Seal 26 Piston Seal 27 Inlet Nozzle Seal 28 Outlet Nozzle 29 Upper Outlet Nozzle Seal 30 Body Plug Seal 31 Spool Seal 32 Lower Outlet Nozzle Seal 33 Outlet Seat 34 Spool 35 Diaphragm Retainer Washer 36 Diaphragm Plate 38 Sense Plate 39 Lock Washer 40 Diaphragm Seal 41 Body/Case Seal 42 Diaphragm Shield 43 Sense Piston 44 Piston Sense Seal page 4

/S1, /S

/S1/NACE, /S/NACE

See Soft Goods See Soft Goods See Soft Goods A564-630 (17-4PH) SS See Soft Goods

Viton® Viton® Viton® A564-630 (17-4PH) SS Viton®

See Soft Goods See Soft Goods See Soft Goods See Soft Goods See Soft Goods A479-316 SS A479-316 SS

Viton® Viton® Viton® Viton® A479-316 SS A479-316 SS

A479-316 SS

A479-316 SS

A479-316 SS A479-316 SS See Soft Goods See Soft Goods Teflon®-FEP A479-316 SS See Soft Goods

A479-316 SS A479-316 SS Viton® Viton® Teflon®-FEP A479-316 SS Viton®