PRESSURE VACUUM RELIEF WITH PIPE-AWAY
MODELS 1720A & 1760A
The Groth 1700 Series relief valves are designed with inlet and outlet flanges of the same size to reduce installation costs by having smaller downstream piping. Model 1720A valves are designed for systems requiring pressure and vacuum relief. Model 1760A valves are designed for systems requiring only pressure relief.
Technical Details
• Size: 2” (DN50), 3” (DN75) and 4” (DN100)
• Materials: Carbon Steel, Stainless Steel or Fiberglass
• Seat and Pallet Materials: 316 Stainless Steel
• Same size inlet and outlet connections
• Manufactured in an ISO9001 Certified manufacturing facility
• Higher set pressures (in weight loaded configuration) than standard pipe-away valves
• Steel and Aluminum Models ATEX Certified
• Fiberglass Furan 800 Model 1760A PED certified
Features
• Cushioned Air Seating
• Center and peripheral pallet guiding
• Self-draining body
• Fluoropolymer seating diaphragms minimize sticking caused by resinous vapors and atmospheric moisture
• Self draining housing body and drop rings to protect seating surfaces from condensate and freezing
• Design avoids pressure or vacuum buildup doe to binding or clogging of the valve
Options
• Seating Diaphragm Options: Buna-N, FKM and other materials
• Stainless Steel Weights
PAGE 2
Model 1720A
Model 1760A
2 X 2
4
SPECIFICATIONS
PAGE 3
C A E Model 1720A Model 1760A Size In A In (mm) B In (mm) C In (mm) D In (mm) E In (mm) Weight Lbs (kg) AA In (mm) BB In (mm) C In (mm) DD In (mm) E In (mm) Weight Lbs (kg)
13.50 (343) 14.63 (372) 6.50 (165) 6.75 (171) 4.75 (121) 80 (36) 7.75 (197) 11.88 (302) 6.50 (165) 3.88 (99) 4.75 (121) 50 (23)
18.0 (457) 17.38 (441) 8.00 (203) 8.00 (203) 6.00 (152) 105 (48) 10.00 (254) 14.13 (359) 8.00 (203) 4.75 (121) 6.00 (152) 70 (32)
3 X 3
19.25 (489) 19.50 (495) 9.00 (229) 9.13 (232) 6.50 (165) 150 (68) 10.75 (273) 16.50 (419) 9.00 (229) 6.06 (154) 6.50 (165) 92 (42) B D AA E BB DD
X 4
MODEL 1720/1760 PRESSURE RELIEF CAPACITY
0.90.54.7910.718.1
1.00.65.1511.519.5252.45149332563
20.011.623.652.478.550049.068015142467
25.014.426.558.984.7 30.017.329.260.390.2
34.620.031.564.594.6
41.624.034.870.5102
Flow Capacity Calculation
Flow capacity values listed above are based on full open valves at 100% overpressure. Read the flow capacity at 100% overpressure directly from the table above. Use linear interpolation if the set pressure is not listed. If the allowable overpressure is less than 100%, modify the flow capacity using the appropriate “C” factor from the table. If allowable overpressure is more than 100%, consult your Groth Representative.
Calculate the percentage overpressure by the following formula. Note that all pressures are gauge pressure expressed in the same units of measure.
Pf = Flowing pressure
Ps = Set pressure
% OP = [(Pf - Ps)/Ps] x 100
Calculate flow capacity at less than 100% overpressure according to the following example.
Example to find “C” factor from table:
Read “C” factor for 75% overpressure at intersection of row 70 and column 5
“C” factor at 75% OP = 0.87
PAGE 4
1.Read flow capacity at set vacuum from table Flow = 23,100 SCFH 4
% OP = [(7
4)/4]
100
75%
factor
table “C” = 0.87
flow capacity Flow = 0.87 x 23,100 = 20,097 SCFH “C”
%OP0123456789 100.420.430.440.450.460.460.470.480.490.50 200.510.520.520.530.540.550.560.560.570.58 300.590.590.600.610.610.620.630.640.640.65 400.660.660.670.680.680.690.700.700.710.72 500.720.730.730.740.750.750.760.770.770.78 600.780.790.800.800.810.810.820.820.830.84
800.900.900.910.910.920.920.930.930.940.94 900.950.950.960.960.970.970.980.990.991.00 Air Flow Capacity at 100% Overpressure (Double Set Pressure) 1000 Standard Cubic Feet per Hour at 60°F Air Flow Capacity at 100% Overpressure (Double Set Pressure)Normal Cubic Meters per Hour at 0°C Set Pressure [Ps] Size Set Pressure [Ps] Size InWC oz/in2 2" x 2"3" x 3"4" x 4"mmWCmbar2" x 2"3" x 3"4" x 4"
Example Flow Capacity Calculation 3” Model 1760A
InWC Set Pressure [Ps]2.Calculate overpressure
-
x
=
7 InWC Flowing Pressure [Pf]3.Read “C”
from
4.Calculate
Factor Table
700.840.850.850.860.860.870.880.880.890.89
2.01.27.2916.327.6504.90211470797 3.01.78.9420.033.8757.35258577976 4.02.310.323.139.01009.802996671128 6.03.512.728.347.915014.73678181383
30029.452211641963 35034.356512592123
40039.260613492285
8.04.614.732.855.420019.64249461599 10.05.816.536.762.025024.547610601790
15.08.720.345.276.1
60058.874917572627
80078.487218772756
100098.098420522959
1200118108622813243
1500147122923883374
51.930.039.378.3111 57.133.041.482.0116
MODEL 1720 VACUUM RELIEF CAPACITY
Flow Capacity Calculation
Flow capacity values listed above are based on full open valves at 100% over-vacuum. Read the flow capacity at 100% overvacuum directly from the table above. Use linear interpolation if the set vacuum is not listed. If the allowable over-vacuum is less than 100%, modify the flow capacity using the appropriate “C” factor from the table. If allowable over-vacuum is more than 100%, consult your Groth Representative.
Calculate the percentage over-vacuum by the following formula. Note that all pressures are gauge pressure expressed in the same units of measure.
Pf = Flowing pressure
Ps = Set pressure
% OV = [(Pf - Ps)/Ps] x 100
Calculate flow capacity at less than 100% over-vacuum according to the following example.
Example to find “C” factor from table:
Read “C” factor for 75% over-vacuum at intersection of row 70 and column 5 “C” factor at 75% OV = 0.87
Example Flow Capacity Calculation 6” Model 1720A 1.Read flow capacity at set vacuum
7 InWC Flowing Vacuum [Pf]3.Read “C” factor from table “C” = 0.87
4.Calculate flow capacity Flow = 0.87 x 21,900 = 19,053 SCFH “C” Factor Table
PAGE 5
Air Flow Capacity at 100% Over-Vacuum (Double Set Vacuum) 1000 Standard Cubic Feet per Hour at 60°F Air Flow Capacity at 100% Over-Vacuum (Double Set Vacuum)Normal Cubic Meters per Hour at 0°C Set Vacuum [Ps] Size Set Vacuum [Ps] Size InWCoz/in2 2" x 2"3" x 3"4" x 4"mmWCmbar2" x 2"3" x 3"4" x 4" 0.870.504.7010.316.0222.16130290450 1.00.585.0511.017.2252.45149332563 2.01.167.1215.624.2504.90200440680 757.35240530830 4.02.3110.021.934.11009.80280620960 12512.33106901070
17517.23708101260 8.04.6214.030.647.720019.63908601340 22522.14209101420 10.05.7815.634.053.025024.54409601490 27527.046010001560 12.06.9317.037.157.830029.448010401620 15.08.6618.841.164.037536.853011601800 20.011.621.446.872.950049.060013202050 25.014.423.651.580.362561.366014502260 27.716.024.653.883.880078.487218772756 75073.572015702440
6.03.4712.226.741.515014.73407501170
from table Flow = 21,900 SCFH
% OV = [(7 - 4)/4]
100
75%
4 InWC Set Vacuum [Ps]2.Calculate over-vacuum
x
=
100.420.430.440.450.460.460.470.480.490.50 200.510.520.520.530.540.550.560.560.570.58 300.590.590.600.610.610.620.630.640.640.65 400.660.660.670.680.680.690.700.700.710.72 500.720.730.730.740.750.750.760.770.770.78 600.780.790.800.800.810.810.820.820.830.84
%OV0123456789
700.840.850.850.860.860.870.880.880.890.89 800.900.900.910.910.920.920.930.930.940.94 900.950.950.960.960.970.970.980.990.991.00
SETTING RANGES
1760A
2 X 20.5 (2.2)33 (142)––0.5 (2.2)24 (103)––
3 X 30.5 (2.2)33 (142)––0.5 (2.2)24 (103)––
4 X 40.5 (2.2)33 (142)––0.5 (2.2)24 (103)––
The 1700 Series relief valves are also available in spring loaded designs for pressure settings up to 15 psig. Other options include FRP (Furan or Derakane) construction, positive lift indicators and special coatings. Consult the factory for details.
PAGE 6 Model Size (inches) Standard Weights Stainless Steel Weights Pressure oz/in2 (mbar) Vacuum oz/in2 (mbar) Pressure oz/in2 (mbar) Vacuum oz/in2 (mbar) MinMaxMinMaxMinMaxMinMax
X 20.5 (2.2)33 (142)0.5 (2.1)17.4 (74)0.5 (2.2)24 (103)0.5 (2.2)16.5 (71)
X 30.5 (2.2)33 (142)0.5 (2.1)15.5 (66)0.5 (2.2)24 (103)0.5 (2.2)15.2 (65)
1720A 2
3
4 X 40.5 (2.2)33 (142)0.5 (2.1)16.5 (71)0.5 (2.2)24 (103)0.5 (2.2)15.0 (64)
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PAGE 7
HOW TO ORDER
For easy ordering, select proper model numbers
MODEL #
3 = Carbon Steel
5 = Stainless
6 = Vinyl Ester
7 = Furan
Z = Special
Notes
• Include model number and setting when ordering.
5 = 316SS
5 = 316SS
6 = Vinyl Ester
7 = Furan
Z = Special
6 = Vinyl Ester
7 = Furan
Z = Special
(See note regarding seat material)
• For steam jacket, include steam pressure/temperature.
• For special options, consult factory.
O = No Jacket
N = Steam Jacket
S = Vacuum Port
Spacer
H = Vacuum Port
Spacer and Steam Jacket
B = Buna N
K = FFKM
T = Fluoropolymer
V = FKM
Z = Special
• Stainless steel seats are standard with stainless steel and carbon steel bodies.
Indicates a 3” x 3” Model 1720 A with CS body, 316SS seat, 316SS pallet, Buna-N diaphragm, no steam jacket and no special options.
O = No Options
Z = Special Options
1720A 1760A 02" 03” 04”
GROTHCORP.COM
2 0 A 3 0 3 5 B O O 7 5 ooooo oo o o o o o o 1
Example
DIAPHRAGM JACKETOPTIONS
SIZEBODYSEATPALLET
Groth Corporation, LLC reserves the right to alter the information in this publication without notice. // © 2021 Groth Corporation, LLC Reproduction without written permission is prohibited. LIT19146 // 0321