Overview

Product Series Description

Our Triple Duty Valves

Our ETDV triple duty valves are primarily required on the discharge side of a centrifugal pump in a hydronic heating or cooling system. The valves functions as a shut-off valve, spring loaded silent check valve, and balancing valve. 

Our ETDV has an automatic and silent operation. The disc will open when the line pressure is approximately 1/4 PSI. As the line pressure approaches zero, the spring will close the disc to prevent flow reversal and water hammer. The flow through the valve can be adjusted from bubble tight shut-off to full flow by the acme rising stem.

The center guided soft seal disc ensures that there is no leakage. The rising stem design includes an adjustable position indicator for accurate disc positioning for throttling service. The unit comes with a standard gauge taps at both the inlet and outlet sides and a NPT drain plug.

Our ETDV’s are constructed from rugged cast iron castings that are machined to exacting specifications. These bodies have drilled flanges that are in accordance with ASME B16.1.

Features & Benefits

3 Valves in 1 A triple duty valve replaces a balance valve, shut-off valve, and a check valve.
Flanges Valves are complete with FF flanges in accordance with ASME B16.1.
Automatic & Silent Operation The valve is spring loaded to ensure that the disc closes as the line flow approaches zero. This feature prevents water hammer.
Line Pressure Line pressures of approximately 1/4 PSI will open the disc.
Flow Adjustment Flow through the valve can be adjusted from zero to full flow by the ACME rising stem.
Bubble-Tight Sealing Soft-seated dovetail O-ring groove ensures bubble-tight sealing when the valve is positioned in the fully closed position.
Graduated Position Indicator The rising stem incorporates a graduated position indicator to ensure accurate disc positioning for the throttling service.
Hand-Wheel All valves supplied with hand-wheel for ease of operation.
Connection Plugs Drain and differential connections are furnished with a plug as standard.
Specifications

Dimensional Data

Size
in/mm
A
in/mm
B
in/mm
C
in/mm
D N.P.T.
in/mm
E N.P.T
in/mm
Weight
lb/kg
2
50
8.38
213
9.63
244
6.25
159
1/2
15
1/4
8
34
15
2 1/2
65
9.88
251
10.00
254
6.25
159
1/2
15
1/4
8
40
18
 3
80
10.00
254
10.13
257
9.38
238
1/2
15
 1/4
8
50
23
 4
100
14.50
368
 12.63
321
 9.38
238
1/2
15
1/4
8
100
45
 5
125
16.00
406
16.38
416
11.00
279
1/2
15
 1/4
8
155
70
 6
150
18.00
457
17.50
444
11.00
279
3/4
20
1/4
8
200
91
 8
200
21.50
546
18.50
470
12.50
317
3/4
20
1/4
8
350
159
 10
250
 22.50
648
21.75
552
12.50
317
1
25
1/4
8
480
218
 12
300
30.00
762
24.50
622
12.50
317
1
25
1/4
8
898
408
14
350
30.38
772
29.63
753
12.50
317
1
25
1/4
8
898
408
16
400
35.50
902
32.63
828
12.50
317
1
25
1/4
8
1172
533

Notes

  1. Dimensions shown are subject to change.
  2. Dimensions are given in full open position.
Parts

Parts List

Item Description Specification
1 Valve Body A126-B Cast Iron
2 Cover Flange A126-B Cast Iron
3 Valve Disc A536 Nickle Plated/Bronze B62
4 Valve Stem Type 410 Stainless Steel
5 Valve Seat Guide A536 Nickle Plated Ductile Iron
6 Flange Gland A126-B Cast Iron
7 Packing Non-Asbestos
8 Valve Spring 300 Series Stainless Steel
9 Packing Gland A126-B Cast Iron
10 Valve Stem Guide A536 Ductile Iron
11 Valve Seat Ring A536 Nickle Plated Ductile Iron
12 Valve Seat Seal EPDM O-Ring
13 Valve Disc Seat EPDM O-Ring

Parts Diagram

Performance

Performance Data

Size (in) 2 2 1/2 3 4 5
Size (mm) 50 65 80 100 125
CV 82 128 188 334 497
Size (in) 6 8 10 12 14
Size (mm) 150 200 250 300 350
CV 701 1079 1826 2430 3225

Notes

  1. Values are Cv rating at 100% of stem rise.
  2. Cv is defined as the volume of water that will flow through a given restriction or valve opening with a pressure drop of one (1) PSI at room temperature.
  3. Maximum pressure drop should not exceed 10 PSID.
  4. For balancing a recommended 1.5 PSID of pressure drop is required for flow determination.

Operational Limitations

Upper Pressure Limits (Non-Shock)

Elbi Series Body Material M.A.W.P.
PSIG (Bars)
ETDV A126-B 200 (13.79) Sizes <= 12″
150 (10.34) Sizes >= 14″

Note: Pressure-temperature ratings in accordance with ASME B16.1. Temperature limited by seal material.

Upper Temperature Limits

Seal Material Upper Units °F (°C)
BUNA-N 212 (100)
EPDM * 250 (121)
VITON 400 (204)

* Standard seal material is EPDM.

Lower Temperature Limits

Body Material Upper Units °F (°C)
A126-B -20 (-28.9)

Contact Us

Elbi Of America, Inc.
15882 Diplomatic Plaza Suite 170 Houston, TX 77032

(713) 674-2900

Hours of Operation

Monday–Friday: 7am–4pm CST
Saturday-Sunday: Closed

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