KA51, KB51 and KC51

Bronze Self-Acting Control Valves

Description

The KA, KB and KC range of two-port valves are used in conjunction with Spirax Sarco SA control systems to provide a self-acting temperature control unit.

Available types
KA51 Normally open
KB51 Normally open + phosphor bronze pressure balancing bellows
KC51 Normally open + stainless steel pressure balancing bellows

Note: Pressure balancing bellows enables the valve to operate against higher differential pressures.

Standards
These products fully comply with the requirements of the Pressure Equipment Directive (PED) and carry the mark when so required.

Certification
As standard these products are available with a manufacturers’ Typical Test Report.
Note: All certification / inspection requirements must be stated at the time of order placement.

Sizes and pipe connections

KA51 and KB51: 1″, 1¼”, 1½” and 2″ KC51: 1½” and 2″
Screwed BSP (BS 21 parallel) or NPT connections.
KA51, KB51 and KC51 Bronze Self-Acting Control Valves

Materials

KA51, KB51 and KC51 Bronze Self-Acting Control Valves

No.	Part			Material
1	Body			Bronze	CC 491 KM
2	Bonnet	KA51, KB51 and 1½” KC51		Bronze	CC 491 KM
		KC51	2″	Steel	EN 10213 GP240 GH+N
3	Valve head			Stainless steel	BS 970 431 S 29
4	Valve seat ring			Stainless steel	BS 970 431 S 29
5	Valve seat gasket		1″	Mild steel	BS 1449 CS 4
			1½” to 2″	Reinforced exfoliated graphite
6	Return spring			Stainless steel	BS 2056 302 S 26
7	Stem	KA51 and KB51		Brass	BS 2874 CZ 121
		KC51		Stainless steel	BS 970 321 S20
8	Bonnet gasket			Reinforced exfoliated graphite
12	Bonnet	Studs		Steel	BS 4439 Gr. 8.8
		Nuts		Steel	BS 3692 Gr. 8
13	Bellows	KA51		Phosphor bronze	EN 12449 Cu Sn 6
		KC51		Stainless steel	AISI 316L
14	Bellows gasket			Reinforced exfoliated graphite
16	Plunger			Brass	BS 2874 CZ 121