Full Bore, Standard Bore and Reduced Bore Parallel Slide Gate Valves, Steel Wedge Gate, Steel Bolted Bonnet, Pressure seal Swing Checks & others.
HH Valves are the only company manufacturing the genuine Hattersley Heaton design of Cast Steel Gate, Globe and Check Valves to the requirements of BS EN ISO9001 and the European Pressure Equipment Directive 97/23/EC.
The valves fully comply with BS EN ISO 10434 (AP1600), AP16D, ASME B16.34, BS1873, BS1868, flanges to ASME B16.5 & EN1092-1, butt-weld to ASME B16.25 or other customer requirements.
Forged High Pressure PSV Catalo1 Together with the necessary variety of trim options. Together with the necessary variety of trim options. Valves are supplied to ASME B16.25 BWE schedules or customer requirements. Materials ASTM A216 Gr. WCB and ASTM A217 Gr. WC6, WC9 & C12A Valves can be fitted with by-pass and equalising devices. And can be hand-wheel, gearbox and electrical or pneumatic actuated operation. The HH Valves range of full bore, standard bore and reduced bore high pressure parallel slide gate valves is primarily designed for isolation of steam and feed water as well as many other applications. Features and advantages: A parallel slide valve seat achieves tightness by utilising the line pressure, rather than by mechanical effort which can be the case with a wedge gate valve design. This eliminates the possibility of binding which may occur with a wedge gate valve as a result of large temperature fluctuations within the valve during service. The effort required to seal a parallel slide valve is therefore much reduced over that required to seal a wedge gate valve.This is an advantage when fitting actuators with the parallel slide design allowing smaller sized actuators to be used, resulting in cost savings. A parallel slide valve is ideally suited to in-line maintenance with the re-machining of all internal components being on-centre and with the seat faces only needing to be nominally parallel. The self-aligning disc design of the parallel slide valve creates a wiping action over the seat faces to assist in the removal of contaminates.The hard-faced stellite seats and discs have a sufficient thickness of deposit to allow several re-machining operations to be performed during maintenance before new parts are required. Pillar and stem stop design provides accurate guidance for the valve stem and gives open to close visual position indication. All high pressure valves incorporate a pressure seal bonnet design. The internal pressure acting on the bonnet acts on the resilient, pre-formed, compressed graphite seal ring to form the bonnet seal. The parallel slide design includes a backseat feature which is used when the valve is in the fully open position.The backseat is integrally incorporated within the bonnet by means of a direct, stellite deposited seating face.The stem collar provides the other sealing face and when lapped together with the backseat face, the seal is made. The backseat should ONLY be used to isolate the gland from the line medium in instances when gland leakage is evident and until such time that the valve can be de-pressurised and repaired. UNDER NO CIRCUMSTANCES SHOULD THE BACKSEAT BE USED TO ALLOW GLAND REPAIR WHILE THE VALVE AND SYSTEM IS PRESSURISED. The disc retaining clips are screwed onto the stud during valve assembly and locked in position.This provides sufficient loading and freedom of movement to allow proper alignment and accurate contact to be maintained over the lapped seat and disc sealing faces during thermal expansion and contraction, regardless of the valve orientation. For start-up and regulating duties a vee-port seat with full-faced stellite deposited discs can be provided, allowing accurate flow rate characteristics to be achieved. Together with the necessary variety of trim options STEEL WEDGE GATE VALVES
The core ranges are class 150, 300, 600, 900 & 1500 in flanged and butt-weld end designs meeting the requirements of ASME, API and British Standards. The size range includes up to 24″ bore (larger sizes available on request), class 150 and is manufactured as standard in ASTM A216 Gr. WCB grade of carbon steel. These products are also available in the following materials:-
Therange also includes a Soft Seated, Double Block and Bleed Design with secondary metal seating for applications where positive sealing on both sides of the wedge is necessary.Valve Specification Details
Optional Features
STEEL BOLTED BONNET GLOBE VALVES
The core ranges are class 150, 300, 600, 900 & 1500 in flanged and butt-weld end designs meeting the requirements of ASME, API and British Standards. The size range includes up to 16″ bore (larger sizes available on request), class 150 and is manufactured as standard in ASTM A216 Gr. WCB grade of carbon steel. These products are also available in the following materials:-
Parabolic disc and vee-reg design also available, details on request.
Valve Specification Details
Optional Features
HIGH PRESSURE STEEL PARALLEL SLIDE VALVES
The HH range of pressure seal parallel slide gate valves are designed to ASME B16.34 1690, 2850 and 4500 class. The small bore forged steel size range is ” to 4″ NB in materials ASTM A105 and A182 Gr. F22 / F91. The valve range is a true pressure seal design and has seats, discs and backseat hard faced with stellite 6 or satellite 12 and butt weld ends to ASME B 16.5 standard schedules. The range can be fitted with locking systems, bevel gearboxes, electric actuation and equalising devicesThe larger bore range of CAST steel high pressure parallel slide valves are:- 
Valve Specification Details
Optional Features
STEEL PRESSURE SEALED COVER SWING CHECK VALVES
The core ranges are class 900, 1000, 1500, 1690, 2500, 2850 and 4500 flanged and butt-weld end designs meeting the requirements of ASME, API and British Standards. The size range includes up to 24” bore (larger sizes available on request), and is manufactured as standard in ASTM A216 Gr. WCB grade of carbon steel.These products are also available in the following materials:- 
Valve Specification Details
Optional Features