Yoshitake EB-11 and EB-12 are sleeve-type bellows expansion joints designed to handle thermal expansion and contraction in piping systems. Suitable for steam, air, cold and hot water, oil, and other non-dangerous fluids, these joints feature a robust construction with an outer pipe to protect the bellows from external impact and an inner stainless steel pipe to minimize fluid pressure loss, vibration, and corrosion. The EB-11 represents the single type, while the EB-12 is the double type.

Features

• Control ring is provided for the purpose of reinforcement against internal pressure and equalization of bellows expansion.
• No need for retightening and replacement due to aging since packing is not used. Easy to maintain and manage.
• Simple structure since the flange, short pipe and bellows are united.
• Outer pipe is attached in order to protect the bellows from damage due to external impact.
• Stainless steel inner pipe is attached in order to prevent fluid pressure loss, vibration, impact, corrosion, etc.
• Stainless steel made wetted parts offer high resistance to corrosion and ensures distinguished durability.

EB-12

Specifications

Model	EB-11 / EB-12
Application	Steam, Air, Cold and hot water, Oil, Other non-dangerous fluids
Maximum pressure	2.0 MPa
Max. temperature	220°C
Max. axial extension	EB-11: 35 mm (Expansion 10 mm, Compression 25 mm) EB-12: 70 mm (Expansion 20 mm, Compression 50 mm)*
Material (Outer pipe)	Carbon steel
Material (Bellows, inner pipe)	Stainless steel (SUS316L)
Connection	JIS 20K RF flanged

INFO

• Expansion of one side from the centering anchor base is 10 mm and compression is 25 mm. Available with nominal size from 300A to 450A (Single type: EB-7, Double type: EB-8).

EB-8

Dimensions and Weights

EB-11 Dimensions

Nominal size	L	Max. operating length	Min. operating length	Max. axial extension	Do	d	l	Weight (kg)
20A	365	375	340	35	58.2	100	235	2.7
25A	365	375	340	35	58.2	125	235	3.6
32A	365	375	340	35	73.2	135	235	4.4
40A	365	375	340	35	73.2	140	235	5.3
50A	365	375	340	35	98.2	155	239	6.8
65A	415	425	390	35	109.7	175	289	9.5
80A	415	425	390	35	135.7	200	288	13.1
100A	415	425	390	35	161.7	225	288	13.9
125A	440	450	415	35	212.1	270	292	34.7
150A	440	450	415	35	235.1	305	293	43.2
200A	440	450	415	35	291.6	350	280	55.8
250A	465	475	440	35	332.6	430	287	85.7

INFO

Available with nominal size from 300A to 450A as model EB-7.

EB-12 Dimensions

Nominal size	L	Max. operating length	Min. operating length	Max. axial extension	Do	d	H	J	K	A	B	C	h1	Bolt size	Weight (kg)
20A	680	700	630	70	58.2	100	100	100	60	135	95	3.2	12	M10	4.8
25A	680	700	630	70	58.2	125	100	100	60	135	95	3.2	12	M10	5.7
32A	680	700	630	70	73.2	135	120	100	70	135	105	3.2	12	M10	7.5
40A	680	700	630	70	73.2	140	120	100	70	135	105	3.2	12	M10	7.6
50A	680	700	630	70	98.2	155	130	100	80	140	120	3.2	15	M12	10.8
65A	780	800	730	70	109.7	175	140	120	100	160	140	4.0	15	M12	13.4
80A	780	800	730	70	135.7	200	150	120	110	160	150	4.0	15	M12	18.2
100A	880	900	830	70	161.7	225	170	120	130	160	175	4.0	19	M16	21.6
125A	880	900	830	70	212.1	270	200	120	150	175	205	4.0	19	M16	48.2
150A	930	950	880	70	235.1	305	220	160	180	215	235	4.5	23	M20	58.5
200A	930	950	880	70	291.6	350	250	160	220	215	285	4.5	25	M22	80.4

INFO

Available with nominal size from 300A to 450A as model EB-8.

Construction and Parts

WARNING

Be sure to remove the Shipping Washer and Shipping Bolt after installation (Fixing point and guide execution).

No.	Name of Parts	Material	Q.TY
1	Packing Seat	Stainless Steel (SUS316L)	2
2	Flange	Rolled Steel (SS400)	2
3	Guide Pipe	Carbon Steel Tube (STK / SGP)	1
4	Ring	Rolled Steel (SS400)	1
5	Bellows	Stainless Steel (SUS316L)	1
6	Control Ring	Rolled Steel (SS400)	1 set
7	Outside Pipe	Rolled Mild Steel (SPHC / SS400)	1
8	Inside Pipe	Stainless Steel (SUS316L)	1
9	Ring	Rolled Steel (SS400)	1
10	Shipping Washer	Rolled Mild Steel (SPHC)	3
11	Shipping Bolt	Rolled Steel (SS400)	3 set
12	Guide Pipe	Carbon Steel Tube (STK)	1

Note: Material specifications may vary slightly between different nominal sizes and single/double types based on the technical drawings.