Introduction

Valves and filters form an essential part of any process plant or system in a wide range of applications from relatively simple on/off functions to flow control, pressure relief and filtering.

All wetted parts of valves and fitters described in this section of the catalogue are constructed from borosilicate glass, PTFE, Ceramic, FEP, PFA or tantalum thus ensuring maximum resistance to corrosion. In addition, as valves have a glass body, visual monitoring of the valve operation is possible at all times.

For standard flat Buttress end connections from DN 25 to DN 150, it is possible to achieve a 3  deflection in the joint by using a flexible gasket. Details of these and all other couplings and gasket can be found in section -Couplings.

The valves described in this section of the catalogue comply, which means that 90° bends, tee pieces and equal crosses (see section – Pipeline Components) are interchangeable with certain type such as angle valve.

DN refers to the nominal bore. Unless otherwise stated, all dimensions are given in mm.

For permissible operating conditions, Unless otherwise stated in the individual description, please see section –Technical Information. Generally, the maximum operating temperature for valves is 200°C but temperature above ambient, particularly in the range from 120°C to 200°C, impose restrictions on the permissible operating pressure.

A wide variety of valves are available for a range of purposes. All have borosilicate glass bodies. As a result operation of the valve can be checked visually. In practically every case glass is combined with PTFE, which ensures that the valves have maximum resistance to corrosion.

All the valves are suitable for use under full vacuum. Pressure ratings at ambient temperature are indicated in the tables applicable to each type of valve.

The maximum operating temperature is 200° C but temperatures above ambient particularly in the range 120° C to 200° C, impose restrictions on the permissible operating pressure. In case of doubt it is advisable to consult us.

These valves comply with ISO 3587 where applicable. Thus maximum interchangeability of compatible components is assured. For example, angle valves can be interchanged with 90 ells, equal tee pieces and equal crosses.

 DN refers to nominal bore. Unless otherwise stated dimensions are in millimeters. Figures given for maximum recommended working pressure represent pressure above atmospheric.

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Straight Through Valves

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Angle Valves

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Drain Valve  

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Vent Valve

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Hand Control Valve

CV values are in gpm with a 1 psi pressure drop, valve fully opened.

These valves are used to obtain a fine variation in flow rate. They can be used with both liquids and gasses and give accurate linear control. If required, a pneumatic actuator can be substituted for the handwheel and bonnet assembly.

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Adjustable Overflow Valve

The figure in liters/hour (L/H) is the maximum flow through the valve.

These valves provide a means of externally adjusting the level inside a vessel. They are ideal for use with liquid separators or liquid-liquid extractors. The lower end of the PTFE bellows is in the form of a tube of accurately machined external diameter, which fits inside a precision bore glass tube. Its position can  adjusted within given limits (L3) to set the required overflow level. In applications where the system is nor self venting via the overflow line, a vent line can be connected to the DN15 nozzle.

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Pressure Relief Valve

Two types of pressure relief valve can be supplied: weight operated or springs operated. Both are constructed of glass and PTFE, without glands. Sealing of moving parts is effected by a PTFE bellows.

The valves are designed to meet the requirements of the German Technical Control Association (TUV) and can be supplied complete with TUV certificate, if required.

The maximum recommended operating temperature is 150° C and a range of pressures, as indicated below can be accommodated. Please not that a change in the setting of the blow-off pressure invalidates the original TUV certification. Both types of pressure relief valves should be installed with the spindle vertical and adequate support should be given.

Since these are special order items, when ordering please specify the following:

• Catalog reference

• Pressure range

• Blow-off pressure

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Weight-Operated Pressure Relief Valves

Pressure ranges available (bar.g):

0.2 -- 0.27
0.25 -- 0.4
0.3 -- 0.6
0.5 -- 1.1
0.9 -- 1.4
1.5 -- 2.2

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Spring-Operated Pressure Relief Valves

Pressure ranges available (bar.g):

0.5 -- 0.7
0.8 -- 1.3
1.4 -- 2.0
2.1 -- 2.9
3.0 -- 3.5

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Ball Type Non-Return Valves

These valves are for use only in vertical pipelines. Like glass spacers, they are fitted between standard buttress end components using longer coupling bolts.

Ball-type non-return valves are supplied complete with glass body, glass ball and PTFE retaining plate.

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Flap Type Non-Return Valves

Flap-type non-return valves can be installed in both vertical and horizontal pipelines. The flap is manufactured from PTFE and is mounted on a tantalum hinge to ensure maximum corrosion resistance.

These larger sizes of flap –type non-return valve are, like NRD type non-return valves, fitted between standard buttress end components using longer coupling bolts. They can be used in both vertical and horizontal pipelines. As they are manufactured from PTFE, no gasket is required on either side of the valve between the PTFE face and the standard glass buttress end. RKP type non-return valves incorporate a tantalum hinge and are supplied complete.

DN (mm)	d (mm)	L (mm)	Cat Ref
80	55	24	GRKP 3
100	82	24	GRKP 4
150	125	24	GRKP 6

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Bottom Outlet Valves

Type BAS and BAL bottom outlet valves are designed specifically for use with such types of glass items, which have an integral glass seat sealed into the bottom outlet.

The position of the valve seat is such that it reduces the accumulation of solids in the vessel or drain neck.

Valve seats can be sealed into either spherical or cylinderical vessels as per requirement.

DN (mm)	DN1 (mm)	D (mm)	L (mm)	L1 (mm)	L2 (mm)	L3 (mm)	L4 (mm)	Cat Ref
40	25	30	270	105	75	110	120	GBAS 1.5
40	25	30	270	105	155	190	120	GBAL 1.5

Bottom Outlet Valves

Unlike type BAS and BAL bottom outlet valves shown above, the type RFC bottom outlet valve is designed for use with spherical and cylindrical vessels which do not have any integral glass seat sealed into the bottom outlet.

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Diaphragm Valves

Diaphragm valves re of conventional basic design. They are glandless and the PTFE diaphragm provides a fine seal with the integral glass weir when the valve is closed.

The maximum continuous operating temperature is 120°C and the maximum thermal shock is 100°C.

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