Esfahan Steam Equipment - CONTROL VALVE 51C TYPE WITH PNEUMATIC DIAPHRAGM ACTUATOR

1. 51C TYPE TWO WAY PNEUMATIC DIAPHRAGM CONTROL VALVE (on-off)

Description:
	The 51C type is a range of two - way cast iron single seat globe valves with pneumatic actuator in sizes DN25 to DN80 ( 1" to 3" ) available with flanged connections , suitable for steam and liquid. The 51C type provides characterized on/off flow control, which contains two types, normal close (N.C.) and normal open (N.O.). The pneumatic actuators are a range of single spring shut-off actuators having 3 diaphragm sizes for matching the requirements of various differential air pressures. Each actuator is fitted with a combined mechanical stroke indicator.

Dimensions :

Size	Type of actuators			Operating type
	S1	S2	S4	N.C.	N.O.
	W	W	W	L	L	H	G
DN25 ( 1" )	128	-	265	118	160	183	57
DN32 (1 ¼" )	128	-	265	118	160	183	70
DN40 (1 ½" )	-	183	265	205	205	317	75
DN50 ( 2 " )	-	183	265	205	205	317	83
DN65 ( 2 ½" )	-	183	265	320	320	340	92
DN80 ( 3 " )	-	183	265	320	320	340	100

Sizes and Pipe Connections:
	DN 25, 32, 40, 50, 65, 80 Flanged PN16 (DIN 2502) are available.

Limiting Conditions :

Maximum design pressure	10 kgf/cm²
Maximum design temperature	Yoke A 180°C
Maximum design temperature	Yoke B 300°C
Maximum cold hydraulic test	20 kgf/cm²
Body design conditions	PN 10

Technical Data :

Applicable Fluid	Steam liquid
Operating	Direct acting	Normal close
		Normal open
Type of valve	Single seated
Characteristics	On - off
End connection	Flanged PN 16
Leakage	Metal to metal ( 0.01% of Cv )
Air supply actuator connection	¼" PT
Actuating	Pneumatic
Flow characteristics	Fast acting
Yoke type	A : Type A for fluid temp. 180 °C
	*B : Type B for fluid temp. 300 °C

Note: Type B is available with our order confirmation.

Available Type :


Valve Type	Type of Diaphragm	Type of Operating	Air Operating Pressure Range (psi)

51C - S1 - N.C	51C1 di	Normal Close	* 45 - 70

51C - S1 - N.O	51C1 di	Normal Open	* 45 - 70

51C - S2 - N.C	51C2 di	Normal Close	** 30 - 70

51C - S2 - N.O	51C2 di	Normal Open	** 30 - 70

51C - S4 - N.C	51C4 di	Normal Close	5 - 15

51C - S4 - N.O	51C4 di	Normal Open	5 - 15

* These Types are available only in DN25 and DN 32
** DN25 and DN32 Range 20-70 psi, DN40 to DN80 Range 30-70 psi

Weights (Kg):

	Normal Close			Normal open
Size	S1	S2	S4	S2	S4
DN 25	5.8	---	10.5	7	10
DN 32	6.6	---	11.5	8.8	11
DN40	---	16.5	22	16.5	22
DN50	---	17.5	23	---	23
DN65	---	26	31	---	31
DN80	---	27	32	---	32

Cv Valves:

Size	DN 25	DN 32	DN 40	DN 50	DN 65	DN 80

CV	10	12	20	31	52	69

Note: The capacity of E.S.E control valves is expressed as flow co-efficient Cv.
The flow co-efficient valve Kvs is extensively used in Europe. Cv=1.167 Kvs.

Materials :

No.	Part	Material
1	Body	G.G. 25
2	Seat	S.S. 430 or 316
3	Plug	S.S. 430 or 316
4	Pin	S.S. 304 or 316
5	Stem	S.S. 304 or 316
6	Gasket	Clingrit
7	Bonnet	G.G. 25
8	Packing	Graphite or Teflon
9	Stud Bolt	C.S. Galva
10	Spring Gasket	C.S. Galva
11	Nut	C.S. Galva
12	Boss	Brass
13	Packing Flange	Brass
14	Yoke	G.G. 25
15	Yoke Lock Nut	Brass
16	Spring	Cadmium Plate
17	Spring Washer Up	G.G. 25
18	Diaphragm Plate	Gray Cast
19	Diaphragm	Nylon insert or silicon rubber
20	Upper Diaphragm Casing	ST37 (C.S.)
21	Actuator Stem Screw	C.S.
22	Bolt	C.S. Galva
23	Spring Gasket	C.S. Galva
24	Nut	C.S. Galva
25	Name Plate	Aluminum
26	Pin	Aluminum

Installation:

The valve should be installed in a horizontal pipeline with the direction of flow as indicated by the arrow on the valve body. The air supply should be installed in the ¼" PT air supply connection on top of the actuator

How to Order:

Example: DN25 51C-S4-N.O.Diaphragm control valve with yoke A.

Design and specifications are subject to change without notice.