Esfahan Steam Equipment

3. 51Y TYPE TREE WAY PNEUMATIC DIAPHRAGM CONTROL VALVE (proportional)

Description:
	The 51Y type is a range of three-way cast iron single seat globe valve with proportional pneumatic actuators in sizes DN25 to DN80 (1" to 3 ") available with flanged connections, suitable for steam, water and oil. The pneumatic actuators are a range of single spring linear actuators having a diaphragm for 3-15 psi (0.2-1 bar) air pressure. Each actuator is fitted with a combined mechanical stroke indicator. For control with pneumatic actuators an I/P transducer is required. The 51Y type can be assembled with a Motor actuator with various specification.

Dimensions (mm):

Size	W	L	H	G	CV Valve	Wt. Kg
DN25 ( 1" )	265	120	455	90	8	20.5
DN32 (1 ¼" )	265	120	455	100	10	21.5
DN40 (1 ½" )	265	202	455	120	18	25
DN50 ( 2 " )	265	202	495	125	28	29
DN65 ( 2 ½" )	265	322	548	155	42	41
DN80 ( 3 " )	265	322	550	155	51	43

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	For Oil 300 °C
Maximum cold hydraulic pressure test	20 kgf/cm²
Body design conditions	PN 16

Technical Data :

Applicable Fluid	Steam, Water and Oil
Operating	Linear
Type of valve	Three-way diverting type
Characteristics	Proportional
Air Operating range	3 - 15 psi (0.2 - 1 bar)
End connection	Flanged PN 16
Stem Seal	Graphite packing
Plug Design	Parabolic

Materials :

No.	Part	Material
1	Body	G.G. 25
2	Bottom Flange	G.G. 25
3	Yoke	G.G. 25
4	Packing Flange	Cast Iron
5	Upper Diaphragm Casing	ST37 (C.S.)
6	Lower Diaphragm Casing	ST37 (C.S.)
7	Diaphragm Plate	Cast Iron
8	Casing Ring	Cast Iron
9	Spring	Cadmium Plate
10	Actuator Stem	ST37 (C.S.)
11	Valve Stem	S.S. 304 or 316
12	Lower Spring Bottom	Cast Iron
13	Spring Adjuster	Brass
14	Seat Ring	S.S. 430 or 316
15	Valve Plug	S.S. 430 or 316
16	Yoke Lock Nut	Brass
17	Diaphragm	Nylon Insert
18	Plug Nut	S.S. 304 or 316
19	Packing	Graphite or Teflon
20	Name Plate	Aluminum
21	Stud Bolt	C.S. Galva
22	Spring Gasket	C.S. Galva
23	Nut	C.S. Galva
24	Bolt	C.S. Galva
25	Spring Gasket	C.S. Galva
26	Nut	C.S. Galva
27	Nut	C.S. Galva
28	Indicator	S.S. 304
29	Gauge	Aluminum
30	Bolt	C.S.
31	Actuator Stem Screw	C.S.
32	Pin	Aluminum
33	Bolt	C.S. Galva
34	Spring Gasket	C.S. Galva
35	Bolt	C.S. Galva
36	Dyne Seat Washer	Rubber

Installation:

The valve should be installed in a horizontal pipe line.
The air supply should be installed in the 1/4" PT air supply connection on top of the actuator.

How to Order:

Example: DN 25-51Y for hot oil with air actuator.

Design and specifications are subject to change without notice.