Product Overview

The FT43 is a cast iron bodied ball float steam trap having stainless steel working internals and automatic air venting facility. The trap is supplied with integrally flanged connections and can be maintained without disturbing the pipework. Vertical flanged connections are available for all sizes. Flow direction for the horizontal trap is clearly illustrated on the body. For vertically orientated traps, the flow is downwards only.

Product Features

• Available Options:
  • FT43: Horizontal flow
  • FT43V: Vertical flow
• Standards: This product fully complies with the requirements of the EU Pressure Equipment Directive/UK Pressure Equipment (Safety) Regulations and carries the CE mark when so required.
• Certification: This product is available with a manufacturers' Typical Test Report. All certification/inspection requirements must be stated at the time of order placement.
• Optional Extras:
  • A manually adjustable needle valve (designated 'C' on the nomenclature i.e., FT43-C) can be fitted to the horizontal versions of FT43. This option provides a steam lock release (SLR) feature in addition to the standard air vent. Vertical versions can be supplied either with an SLR or an Air Vent. The 'C' version is not available upon a vertical version FT43V.
  • The top of the cover can be drilled and tapped ⅜" BSP or NPT for the purpose of fitting a balance line if requested at the point of order.
  • The bottom of the cover can be drilled and tapped ⅜" BSP or NPT for the purpose of fitting a drain cock if requested at the point of order.

Sizes and Pipe Connections

Size	Flange Standard	Notes
DN25	EN 1092 PN16, ASME 125, JIS/KS 10	Flow (FT43 horizontal): Left to Right (R-L versions available for PN16). Flow (FT43V vertical): Downwards.
DN40, DN50	EN 1092 PN16, ASME 125	Flow (FT43 horizontal): Right to Left. Flow (FT43V vertical): Downwards.

Standard flanges are EN 1092 PN16 with face-to-face dimensions in accordance with EN 26554 (Series 1).Note: ASME flanges are supplied with tapped holes to receive flange bolts. JIS/KS flanges will be supplied drilled as normal with plain bolt holes.

Pressure / Temperature Limits

Parameter	Value
Body Design Conditions	PN16
Maximum Allowable Pressure (PMA)	16 bar g @ 120 °C
Maximum Allowable Temperature (TMA)	220 °C @ 12.1 bar g
Minimum Allowable Temperature	0 °C
Maximum Operating Pressure (PMO)	13 bar g @ 195 °C (for saturated steam service) Note: The DN40 and DN50 traps are limited to a PMO equal to PMX
Maximum Operating Temperature (TMO)	220 °C @ 12.1 bar g
Minimum Operating Temperature	0 °C
Maximum Differential Pressure (ΔPMX)	FT43-4.5: 4.5 bar FT43-10: 10 bar FT43-14: 13 bar
Maximum Cold Hydraulic Test Pressure	24 bar g Note: With internals fitted, test pressure must not exceed ΔPMX

Materials

No.	Part	Material	Standard
1	Body	Cast iron	EN-JL 1040
2	Cover bolts (DN25)	Steel	BS 3692 Gr. 8.8
2	Cover stud	Steel	BS 4882 - B7M
2	Cover nuts	Steel	BS 3692 Gr. 8.8
3	Cover gasket	Reinforced exfoliated graphite	-
4	Cover	Cast iron	EN-JL 1040
5	Valve seat (DN25)	Stainless steel	BS 970 431 S29
5	Main valve assembly with erosion deflector (DN40, DN50)	Stainless steel	BS 3146 Part 2 Anc 2
6	Valve seat gasket (DN25)	Stainless steel	BS 1449 304 S11
6	Main valve assembly gasket (DN40, DN50)	Reinforced exfoliated graphite	-
7	Pivot frame assembly bolts (DN25)	Stainless steel	BS 4183 18/8
7	Main valve assembly bolts (DN40)	-	BS 970 304 S16
7	Studs and nuts (DN50)	-	BS 6105 A4.80
8	Ball float and lever (DN25)	Stainless steel	BS 1449 304 S16
8	Ball float (DN40, DN50)	Stainless steel	BS 1449 304 S16
9	Support frame	Stainless steel	BS 1449 304 S16
10	Pivot frame	Stainless steel	BS 1449 304 S16
11	Pivot pin	Stainless steel	-
12	Erosion deflector	Stainless steel	BS 970 431 S29
17	Air vent assembly	Stainless steel	-
18	Air vent seat gasket	Stainless steel	BS 1449 409 S19
19	SLR assembly	Stainless steel	BS 970 303 S21
20	SLR gasket	Mild steel	BS 1449 CS4
21	SLR seal	Graphite	-
26	Inlet plate (DN40, DN50)	Stainless steel	BS 1449 304 S15

Dimensions and Weights

Size	A (mm)	B (mm)	C (mm)	D (mm)	E (mm)	F (mm)	Weight (kg)
DN25	160 (PN16) / 148 (ASME 125)	110	80	245	160	215	8.3
DN40	230 (PN16) / 221 (ASME 125)	128	110	330	200	200	21.5
DN50	230 (PN16) / 220 (ASME 125)	140	126	340	200	225	30.5

Capacities

Capacities shown are based on condensate at saturation temperature. Under start-up conditions when the condensate is cold the internal thermostatic air vent will be open and provides additional capacity to the main valve.

Minimum additional cold water capacity (kg/h)

ΔP (bar)	0.5	1	2	3	4.5	7	10	14
DN25, DN40, DN50	460	680	900	1 080	1 300	1 600	1 980	2 050

Spare Parts

The spare parts available are shown in solid outline. Parts drawn in grey line are not supplied as spares.

Available spares:

• Main valve assembly complete with ball float (DN25 horizontal traps)*: 5, 6, 7, 8, 9, 10, 11
• Main valve assembly with erosion deflector (DN40 and DN50) (specify horizontal or vertical trap)**: 5, 6, 7, 12, 26
• Ball float (DN40 and DN50): 8
• Air vent assembly: 17, 18
• Manually adjustable needle valve and air vent assembly: 17, 18, 19, 20, 21
• Complete set of gaskets (packet of 3): 3, 6, 20

* On horizontal traps the erosion deflector on the DN25 is pressed into the body during manufacture and not available as a spare.** There is no erosion deflector on vertical traps.

How to order spares: Always order spares by using the description given in the column headed 'Available spares' and state the size and type of trap, including pressure range and orientation i.e. horizontal or vertical connections. Example: 1 - Air vent assembly for a Spirax Sarco DN25 FT43-4.5 ball float steam trap, with horizontal connections.

Recommended tightening torques

Item	Part / Size	Across Flats (A/F)	Thread Size / Bolt	Torque (N m)
2	DN25	17 A/F	M10 x 30	29 - 33
	DN40	19 A/F	M12 x 60	60 - 66
	DN50	24 A/F	M16 x 70	80 - 88
5	DN25			50 - 50
7	DN25		M5 x 20	2.5 - 2.8
	DN40	10 A/F	M6 x 20	10 - 12
	DN50	13 A/F	M8 x 20	20 - 24
17		17 A/F		50 - 55
19		22 A/F		50 - 55

Installation and Maintenance

For full details see the Installation and Maintenance Instructions (IM-S02-30) supplied with the product. Installation note: The FT43 must be installed with the direction of flow as indicated on the body, and with the float arm in a horizontal plane so that it rises and falls vertically.

Disposal

This product is recyclable. No ecological hazard is anticipated with the disposal of this product providing due care is taken.

How to Order

Example: 1 off Spirax Sarco DN25 FT43-4.5 ball float steam trap, flanged to EN 1092 PN16 with cast iron body and cover with thermostatic air vent.