Direct Acting Steam PRV
Series 800 Regulators Series 810 Direct Acting
The Series 810 direct-acting regulators are ideal for pressure control of equipment with low to medium capacities, providing a lower cost, compact solution to the steam pressure control of autoclaves, steam irons, laundry mangles and sterilizers. Series 810 regulators are used to reduce the steam pressure from distribution lines (100-200 psig) to lower operating pressures (10-140 psig).
Construction Materials 5A
1
21 2 19 18 3 4
6 7 8 5 9 10 12 13 20
17
15
14
14
BODY MATERIAL CI ST STL Bronze
ITEM
QTY.
DESCRIPTION
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 15A 16 17 18 19 20 21 22
1 1 1 1 1 1 VAR VAR 1 1 VAR 1 1 1 1 1 1 1 1 1 1 1 1
Adjusting Screw Lock nut Spring Chamber Spring Button Adjusting Spring Pressure plate Flange Screw Lock Washer Body Gasket Diaphragm Pusher plate Stem Seat Ring Metal Disc Pivoting disc End Cap Valve Spring Gasket Screen Guide Bushing Composition Disc Composition Disc holder
CAD STL CAD STL CI STL 302 SS CI CAD STL STL CI ASB PH BRZ 304 SS 304 SS 304 SS 316 SS 420 SS C BRZ AISI 1070 Teflon 304 SS 304 SS TFE BRZ
304 SS 304 SS 304 SS 304 SS 302 SS 302 SS 304 SS 304 SS 304 SS ASB 304 SS 304 SS 304 SS 304 SS 316 SS 420 SS 304 SS 302 SS Teflon 304 SS 304 SS TFE 316 SS
CAD STL BRS C. BRZ STL 302 SS CI CAD STL STL C BRZ ASB PH BRZ 304 SS 304 SS 304 SS 316 SS 420 SS C BRZ AISI 1070 Teflon 304 SS 304 SS TFE BRZ
14
14
Body and Seal Selection Item
Main Advantages Excellent Tight Shut-Off, obtained through a pivoted disc lapped against the seat until obtaining Class IV or better sealing. Built to last longer than most valves of similar construction, using high quality materials, CNC machining, individual hydrostatic testing and individual leakage testing, Series 810 regulators are guaranteed a long and trouble-free operation.
Material
Cast Iron Body Cast Bronze Stainless Steel Seat Metal-to metal Type Composition disc (PTFE)
Max. Inlet Steam Pressure (psig) 200 300 300 300 250
Sizes ½”- 2” ½”- 1” ½”- 2”
Spring Range Selection Spring Color
Pressure Range (psig)
Valve Sizes
Black Silver Red Copper Yellow Green Blue
3 - 15 10 - 30 10 - 40 25 - 60 55 - 80 55 - 100 75 - 140
½" to 2" ½" to 1 ¼" 1½" & 2” ½” to 2” ½" to 1¼" 1½” & 2” ½" to 1 ¼"
Series 800 Regulators Series 810 Direct Acting
Sizing the Regulator To correctly size the Series 810 regulator for your process, please follow the example below. EXAMPLE: A steam cooker with a 45 psig design pressure requires a PRV to lower the inlet pressure from 125 psig to 30 psig, while consuming 600 lbs/hr of steam. Choose the correct PRV size, so that the shut-off pressure does not exceed 40 psig, while being able to provide the capacity and regulated pressure required. Subcritical Flow P2 P > .58 P1 1
Critical Flow P2 P .58 P1 1 Saturated Steam
W C v 1.71P 1
W C v 2. 1 P ( P 1 P 2 )
Formula Key ? P =
Pressure drop (P1 - P2) P1 = Inlet pressure (psia) P2 = Outlet pressure (psia)
Superheated Steam W (1 .0007T SH ) .0007T SH ) W (1 C v C v 1.75 P 1 P ( P 1 P 2 ) 2.1
TSH =
Steam superheat (°F) W = Steam flow (lbs/hr) Psia = psi+14.7
Step 1: Calculate the required CV as shown on the table above. Make sure you identify whether your application is Subcritical or Critical Flow. In the present example, P2 =0.32 which is less than 0.58 therefore we use the critical flow equation, as follows: P1 W
P1 = 125+14.7=139.4 , C V =
600
=
1.71 x P 1
Step 2:
= 2.5
1.71 x 139.4
Apply a safety factor of 1.2 to the calculated CV value: Required C V = 1.2 x 2.5 = 3.0
Step 3: Using the 10-30 spring range curve in each of the graphs below, we enter each graph through the 3.0 C V value line, and we observe the following: Size Droop(psig)
1/2” N/A
3/4” 11
1” & 1-1/4” 7.5
1 1/” & 1-1/4” 8
Shut-off Pressure(psig)
N/A
41
37.5
38
Cv vs Droop Chart Valve Size: 1/2”
Cv vs Droop Chart Valve Size: 3/4”
0
0
5
) g i 10 s p ( P O 15 O R D
3-15
5
3-15
) g i 10 s p ( P O 15 O R D
10-30
25-60 55-80
25
10-30
25-60
55-80
25
75-140 35
0
0.2
0.4
0.6
0.9
75-140
1.1
1.3
1.5
1.7
2.0
2.2
35
0
0.3
0.6
0.9
1.2
Cv Value
1.5
1.8
2.1
2.4
2.7
3.0
Cv Value
Cv vs Droop Chart Valve Sizes: 1” and 1-1/4”
Cv vs Droop Chart Valve Sizes: 1-1/2” and 2“
0
0
5
5
3-15
) g i 10 s p ( P O 15 O R D
10-30 25-60
55-80
25
3-15
) g i 10 s p ( P O 15 O R D
10-40
25-60
25
75-140 55-100 35
0
0.5
1.0
1.5
2.0
2.5
Cv Value
3.0
3.5
4.0
4.5
5.0
35
0
1.0
2.0
3.0
4.0
5.0
Cv Value
6.0
7.0
8.0
9.0
10.0
Series 800 Regulators Series 810 Direct Acting
Increase Productivity with a proper selection of a steam PRV
Many companies around the world are limiting their productivity with low capacity PRV’s, that considerably reduce the steam flow into their equipment. Batch cooking processes are typical examples of this situation.
Example: A company that manufactures cooked rice, required a total of 300 lbs of 30 psi saturated steam to cook each batch of rice
Scenario 1
Scenario 2
100 PSI
100 PSI
Series 810 3/4” Valve
3/4” Valve
40 PSI Shut-off 30 PSI Regulated pressure
40 PSI Shut-off 30 PSI Regulated pressure
X
Original Wrong Selection
New Corrected Selection
The valve had a 25-80 psi spring, The new valve, a TECVAL Series 810, this gave a C V =0.7 with a 10 psi with a 10-30 spring range, provided droop, down from the 40 psi shut-off a C V =2.55 with a 10 psi droop. pressure. Net Flow= C V x 1.71 x P1 = 0.7 x 1.71 x 114.7 psia
Net Flow= C V x 1.71 x P1 = 2.55 x 1.71 x 114.7 psia
= 500 lbs/hr
= 137.3 lbs/hr
BATCH TIME (hr) :
Batch Time (hrs) =
Required steam (lbs) Flow into cooker(lbs/ hr)
300 (lbs) 137.3 (lbs/hr)
Result: Cooking one (1) batch of rice requires 2.18 hours.
Batch Time (hrs) =
300 (lbs) 500 (lbs/hr)
Result: Cooking one (1) batch of rice requires 36 minutes.
Series 800 Regulators Series 810 Direct Acting
Typical Installation Steam supply
Safety valve Stop valve
Stop valve
Strainer
Reduced Steam Pressure
Condensate Steam trap with Strainer
Selection According to the valve size selected and the required spring range in Sizing the Regulator, the following selection guide will provide a code for the exact specification of the valve.
810
Valve Size NPS 1/2” 3/4” 1” 1-1/4” 1-1/2” 2”
Code 050 075 100 125 150 200
Spring
Body Material Material Cast Iron Cast Bronze Stainless Steel
Code CI CB SS
Spring Color Black Silver Red Copper Yellow Green Blue
Pressure Range (psig) 3 - 15 10 - 30 10 - 40 25 - 60 55 - 80 55 - 100 75 - 140
Seat Type Code K S R C Y G B
Material Metal-to-metal Composition disc (PTFE)
Code 0 1
Example: For the valve selected in the example, a 3/4“ regulator with a 25-80 regulating range spring, and metal-to-metal seal type; the selection code from Sizing the Regulator would be: 810-CI-Y-0.
Series 800 Regulators Series 810 Direct Acting
Other Series 800 Steam Regulators Series 850
1” - 3”
Series 820
Series 830
3
/ 8” to ½ ”
1” to 3”
Pilot operated High capacity High Accuracy
Direct acting Low cost Higher capacities than the 810 Series
Ultracompact Low weight High capacity, low droop. Specially suited for sterilizer applications.
Exclusive North American Representantive
19101 SW 108th Ave. Unit # 19Miami , FL 33157 PH: 305-256-0050
www.tecvalexport.com
FAX: 305-256-0150
[email protected]
www.valvexport.com
Safety
Regulation
Control
